FREE Diagnostic Tools

Anti–Virus Trend Micro Worry Free Business Security Standard and Advanced http://us.trendmicro.com/us/products/sb/worry-free-business-security/index.html Trend Micro offers an excellent range of products of which this is the one we recommend for business users. Panda Security Panda Security for Business http://www.pandasecurity.com/usa/enterprise/solutions/business/ Another fine product line with a range of products that would are able to handle any personal or business A/V requirement.

Malwarebytes

Malwarebytes Anti-Malware 1.33 http://www.download.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?tag=contentBody;mostPopTwoColWrap&cdlPid=10997763

Though a relatively new player in this area it has already proven to be an excellent tool to keep harmful malware off of your PC. It is a product we routinely use to clean compromised PCs.

Ad-Aware

Ad-Aware Anniversary Edition 8.0 http://www.download.com/Ad-Aware-Anniversary-Edition/3000-8022_4-10045910.html?tag=contentBody;mostPopTwoColWrap&cdlPid=10998841

The most popular in terms of number of users.

System Information Wizard (SIW)
http://www.gtopala.com/

Gabriel Topala's application that gives a full, in-depth picture of your entire system. Key information to have in the event of problems.

Trend Micro HiJackThis 2.0.2
http://www.download.com/Trend-Micro-HijackThis/3000-8022_4-10227353.html

A very powerful tool in the hand of an experienced user to clean up seriously infected machines. It assumes that the user is familiar with what is being removed so use with extreme caution.