McAfee Virusscan
Both products are not for free, though, a time limited trial can be downloaded. After the trial is expired you'll need to order a license key or uninstall the product since it stops functioning.
McAfee Virusscan: download
Latest virusdefinitions: download
System requirements: Windows 98, 64 MB Ram
Features:
- Realtime protection: files will be scanned when you download, open, save/use them)
- POP3 (email) scanner, which scans all cinoming and outgoing email, and attachments, for viruses.
- Customizable scan options like selecting certain folders to be scanned for viruses.
- Heuristic scanner, scans for unknown viruses
- Script checker, which scans all scripts executed on your pc
- Spyware/adware scanner
- Low CPU usage, no this is not a feature but worth telling here, since some scanners eat away all the power of your computer and thus slow down your system
Installing and configuring McAfee VirusScan