Are you sure it is a virus?
If you follow all the following steps it should get rid of your problem and prevent future problems. All programs listed are free.
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Update your antivirus and run a full scan in safe mode.
To run in “Safe Mode” read:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/boot_failsafe.mspx?mfr=true
http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2001052409420406
If you do not have virus protection install:
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
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Install Windows Defender (full time spyware protection)
Perform a full scan.
http://www.microsoft.com/athome/security/spyware/software/default.mspx
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Install the following five programs and run weekly or at least monthly. You need all five. 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 and recycle bin options
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 of system restore
After the malware is removed turn on system restore.
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Run this time
Shoot The Messenger
http://www.grc.com/stm/shootthemessenger.htm
Install VX2 tool for Ad-Aware and run tool
http://www.lavasoftusa.com/support/securitycenter/vx2_cleaner.php
CWShredder: run
http://www.trendmicro.com/cwshredder/
SmitFraudFix
http://www.geekstogo.com/forum/How_to_use_SmitFraudFix-t109268.html
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Additional run this time and as needed.
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
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Rootkit Removal Guide
http://safecomputing.umn.edu/guides/scan_unhackme.html
Rootkits Removers (Pick any 2 install and run monthly)
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
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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