PCTools products do get good reviews. The good thing is they have free versions of their products. They work great. Spyware Doctor from the Google pack is a must. I highly recommend it. I bought Webroots Spysweeper and spyware doctor finds stuff spysweeper does not. Having both is a perfect combo and I recommend running two anti-spyware products.
PCTools Anti-Virus
http://www.pctools.com/free-antivirus/
PCTools Threatfire - Malware Protection
This free tool makes your current anti-virus better. Definite Download
http://www.threatfire.com
PCTools Firewall Plus
http://www.pctools.com/firewall/
The Google Pack includes a free starter edition of Spyware Doctor.
http://pack.google.com/intl/en/pack_installer_new.html?hl=en&gl=us&ai=BZy9nzYgZR_j2KofKmwTgjq3mAezuhSGAyqSDAsWNtwEAEAEgw9-LBTgBUIfas8sEYMnG5YbIo-gZoAGWl5z9A7IBDmZvcmRicmFrZXMuY29tyAEC2gEWaHR0cDovL2ZvcmRicmFrZXMuY29tL4ACAagDAw&gclid=CJu2m5HWnI8CFSUYagodtkXDew&ciNum=11
Reviews
http://www.pcworld.com/article/id,136191/article.html
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You can do an online scan for viruses and spyware for free from the major vendors. Some of these require Internet Explorer to run because of Active-X
Trend-Micro
http://housecall.trendmicro.com/
Computer Associates
http://www.ca.com/us/securityadvisor/pestscan/
Panda Software
http://www.pandasecurity.com/homeusers/solutions/activescan/
Symantec Security Check
http://security.symantec.com/sscv6/?langid=ie&venid=sym
Mcafee Free Scan
http://us.mcafee.com/root/catalog.asp?catid=free
Kaspersky Scanner
http://www.kaspersky.com/virusscanner
Microsoft Protection Scanner
http://onecare.live.com/site/en-US/center/howsafe.htm?s_cid=mscom_msrt
F-Secure
http://support.f-secure.com/enu/home/olsbeta.shtml
BitDefender
http://www.bitdefender.com/scan8/ie.html
NOD32
http://www.eset.com/onlinescan/index.php
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Its good to run two anti-spywares even if some extra resources are taken.
SuperAntiSpyware does an excellent job. AVG's full version gets great reviews.
Adaware
http://www.lavasoftusa.com/software/adaware
Microsoft Defender
http://www.microsoft.com/athome/security/spyware/software/default.mspx
AVG
http://free.grisoft.com/doc/avg-anti-spyware-free/lng/us/tpl/v5
Spyware Terminator 2
http://www.spywareterminator.com/
Spybot Search and Destroy
http://www.safer-networking.org/
SuperAntispyware
http://superantispyware.com/
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Anti-Spyware for a cost.
Personally I bought Webroot's Spysweeper, their product is great and well worth the money. Watch Best Buy ads because sometimes it goes on sale for $10 to $15.
Webroot Spysweeper
http://www.webroot.com/consumer/compare/freeware.html?rc=4929
PCTools Spyware Doctor
http://www.pctools.com/spyware-doctor/
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There are free anti-virus scanners availble. They work well. I like AVG and PCTools anti-viruses the best of the free anti-virus programs.
If you are not willing to spend money it is good to have some kind of anti-virus software
avg
http://free.grisoft.com/doc/1
avast
http://www.avast.com/eng/avast_4_home.html
Avira AntiVir
http://www.free-av.com/
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For a Cost
This is my recommendation for anti-virus. Free are good, but they are not as accurate as the top paid anti-virus software
Top-Tier
Kaspersky
http://www.kasepersky.com
Nod32
http://www.eset.com/