You need to tell us more. Is your browser or email hijacked? What symptoms are there? If you have pop ups what exactly does it say? What product does it try to sell you? What web page does it refer you to? There are dozens of special cleaners to remove specific infections.
=====================
The only way to kill it for sure is to wipe the drive, and reformat and reinstall windows.
Backup your data and find all your drivers and software and software keys now and develop a plan on how you will reinstall them.
http://blog.angrypets.com/2006/01/ultimate_prefla.html
http://www.thefuhrmans.com/reformat_hd.htm
http://www.belarc.com/free_download.html
http://www.smartcomputing.com/editorial/article.asp?article=articles/archive/l0910/32l10/32l10.asp
---------------------------------------------
Wipe the drive use any of these three:
All data on the drive will be erased.
http://forums.cnet.com/5208-6142_102-0.html?forumID=5&threadID=194873&messageID=2115918
"You can find out the manufacturer of your HD and then attempt to download the formatting tool created by that manufacturer for their HD's. Most HD Mnufactuer have a Zero Fill Low level formatting tool available to erase their HD products. This will clean any existing OS files from your system as well as any viruses other files etc.."
Darik's Boot and Nuke (DBAN) free
http://www.download.com/Darik-s-Boot-and-Nuke/3000-2092_4-10165154.html
http://sourceforge.net/project/showfiles.php?group_id=61951&package_id=58479&release_id=439240
DBAN will automatically and completely delete the contents of any hard disk that it can detect, which makes it an appropriate utility for bulk or emergency data destruction.
Active@ Kill Disk - Hard Drive Eraser (Free version/ $29.95 enhanced version)
http://www.killdisk.com/
Active@ KillDisk - Hard Drive Eraser is powerful and compact DOS software that allows you to destroy all data on hard and floppy drives completely, excluding any possibility of future recovery of deleted files and folders. It's a hard drive and partition eraser utility.
------------------------------------------------
Format and Reinstall Windows
When you format enter "fdisk /mbr" to format the master boot record.
http://forums.cnet.com/5208-6132_102-0.html?forumID=32&threadID=49909&messageID=593967
Reformat and install. (Cleans drive loses all data)
http://support.microsoft.com/kb/313348
http://www.microsoft.com/windowsxp/using/setup/winxp/install.mspx
http://www.whitecanyon.com/reformat-the-hard-drive-in-windows-xp.php
http://www.smartcomputing.com/editorial/article.asp?article=articles/archive/l0910/32l10/32l10.asp
========================
If you follow all the steps below it should get rid of most if not all of your problems and prevent future problems. All programs listed are free.
---------------------------------------------------------
Update your antivirus and run a full scan in safe mode
If you do not have full time (active) virus protection install (only one) all are excellent. Try AVG first.
AVG Antivirus 7.5 Free Edition
http://free.grisoft.com/freeweb.php/doc/avg-anti-virus-free/lng/us/tpl/v5
http://www.download.com/AVG-Anti-Virus-Free-Edition/3000-2239_4-10669237.html?tag=lst-0-1
or
Free antivirus - avast! 4 Home Edition
http://www.avast.com/eng/avast_4_home.html
or
AOL Active Virus Shield
http://www.activevirusshield.com/antivirus/freeav/index.adp
---------------------------------------------------------
Install Windows Defender (full time spyware protection)
Perform a full scan.
http://www.microsoft.com/athome/security/spyware/software/default.mspx
---------------------------------------------------------
Install the following five programs and run weekly or at least monthly. You need all five. They will greatly increase your protection. They are not a substitute for full time spyware and virus protection.
Ad-Aware SE Personal (update + full scan)
http://www.lavasoftusa.com/products/ad-aware_se_personal.php
Spybot Search & Destroy (update + immunize + scan)
Do not enable Tea Timer and SDHelper
After installation: update + scan + immunize
http://www.safer-networking.org/en/mirrors/index.html
SpywareBlaster: Update then open and click “enable all protection”.
http://www.javacoolsoftware.com/spywareblaster.html
SUPERAntiSpyware free version: (update + scan)
http://www.superantispyware.com/
CCleaner: Do not install toolbar option
Removes tracking cookies, unneeded files, history
In options.
Set to run when computer starts.
Place cookies you want to keep in save list
http://www.ccleaner.com/
-------------------------------------------------------------
Note if a scan detects a problem but is unable to remove, start the computer in safe mode with the internet line disconnected and run a full scan.
In severe cases your system restore files will also be infected. In these cases you will need to turn off system restore to prevent malware hiding in the system restore files and reinfecting the computer during removal or during a future system restore. Turning off system restore deletes the system restore files.
Right click on "my computer"> Properties > System Restore Tab > Check box turn off system restore
After the malware is removed turn on system restore.
-------------------------------------------------------------
Run this time only
CWShredder: run
http://www.trendmicro.com/cwshredder/
Roguefix.bat
http://www.internetinspiration.co.uk/roguefix.htm#uninstall
Shoot The Messenger
http://www.grc.com/stm/shootthemessenger.htm
SmitFraudFix
http://www.geekstogo.com/forum/How_to_use_SmitFraudFix-t109268.html
Vundo Fix and
VirtumundoBegone (if VundoFix does not work)
http://www.bleepingcomputer.com/forums/topic18610.html
VX2 tool for Ad-Aware and run tool (Install and run)
http://www.lavasoftusa.com/support/securitycenter/vx2_cleaner.php
----------------------------------------------------------------------
Additional run this time and monthly.
Microsoft Update "Custom Mode" install everything
http://update.microsoft.com/microsoftupdate/v6/default.aspx?ln=en-us
Microsoft OneCare Live, run “full service scan”
Updates windows, virus and spyware scan, disk cleanup, disk fragmentation (if needed), backs up registry and then cleans registry, and checks for open firewall ports
http://onecare.live.com/site/en-us/default.htm
Malicious Software Removal Tool (run “full scan”)
http://www.microsoft.com/security/malwareremove/default.mspx
-------------------------------------------------------
RootkitRevealer v1.71
http://www.microsoft.com/technet/sysinternals/Security/RootkitRevealer.mspx
Rootkit Removal Guide
http://safecomputing.umn.edu/guides/scan_unhackme.html
Rootkits Removers
Pick any 2 install and run one each month
AVG Anti-Rootkit
http://www.grisoft.com/doc/products-avg-anti-rootkit-update-app-art/?ver=1.1.0.29
F-Secure BlackLight
http://www.f-secure.com/blacklight/
Sophos Anti-Rootkit
http://www.sophos.com/products/free-tools/sophos-anti-rootkit.html
----------------------------------------------------------
----------------------------------------------------------
Online Free Scanners:
Run Trend Micro, Kaspersky, and Panda Scan now.
Run a different one each month.
Trend Micro: HouseCall Free Scan (removes what it finds)
http://housecall.trendmicro.com/
BitDefender Online Scanner http://www.bitdefender.com/scan8/ie.html
Kaspersky Labs Online Scanner http://www.kaspersky.com/virusscanner
McAfee http://us.mcafee.com/root/mfs/default.asp?affid=294
Panda ActiveScan Free Online Scanner http://www.pandasoftware.com/products/activescan?
Symantic Online Scanner http://security.symantec.com/sscv6/ssc_eula.asp?langid=ie&venid=sym&plfid=23&pkj=ALUFRHYTINMHDKDCWLL&vc_scanstate=2
-------------------------------------------------------
Additional Information read:
http://wiki.castlecops.com/Malware_Removal_and_Prevention:_Overview
http://wiki.castlecops.com/Malware_Prevention:_Prevent_Re-infection
http://www.castlecops.com/f67-Hijackthis_Spyware_Viruses_Worms_Trojans_Oh_My.html
http://aumha.org/a/quickfix.htm
http://aumha.org/secure.htm
http://aumha.org/a/parasite.php
http://www.castlecops.com/t102301-Hijackthis_Guidelines_Read_Before_Posting.html
http://www.techsupportforum.com/security-center/hijackthis-log-help/15968-updated-important-read-before-posting-log.html
http://forum.aumha.org/viewtopic.php?t=4075&sid=901703d08c2ace31389ffef2d84b6607