Malware Scanner/Remover
Malwarebytes Anti-Malware – Excellent cleanup tool with heuristics engine which is capable of discerning between legitimate and dangerous programs, so keeps false positives to a minimum. Supports multiple drive scanning and scan-on-demand for individual files. The FileAssassin option under ‘More Tools’ will remove locked files. Recent testing proves this to be among the best free malware scanner/ removers. NOTE: Free version does not contain real-time protection. (XP/Vista 32/64bit)
SuperAntiSpyware – Right up there with MBAM and difficult to pick between them. Complete and custom scanning of hard drives, removable drives, memory, registry and individual folders. Detects and removes all types of malware. NOTE: Free version does not contain real-time protection. (XP/Vista 32/64bit)
A-Squared Free – Was quite quirky but the latest version has fixed that. Detection rates not as good as others. (XP/Vista 32/64bit)
Ad-ware SE – Good product, although not up to MBAM and SAS standards. (XP/Vista 32/64 bit)
Rootkit Scanner/Remover
Sophos Anti-Rootkit - Free easy to use Rootkit detection and removal. (XP)
Trend Micro RootkitBuster - Free rootkit scanner that scans hidden files, registry entries, processes, drivers, and Master Boot Record (MBR) rootkits. In addition, RootkitBuster can also clean hidden files and registry entries. (XP/Vista 32bit)
GMer Rootkit Scanner - Free effective rootkit detection and removal. This one is for the more advanced user. (XP/Vista)
IceSword - Free rootkit scanning and removal. IceSword is a very powerful program which uses an explorer like interface. This one is for the more advanced user. (XP/Vista)