Combofix - To Remove Malware, RootKits, Trojans, Worms and Viruses. Do not download from any other than Bleeping Computer . Must remove AVG or disable other anti-virus programs to use. Best to run in safe mode.
CCleaner - Cleans registry and web cached data. Download newest from Piriform or FileHippo.
MalwareBytes - Clears system of bugs and works great. Small fee to use its fullest potential, but free to use in general and does great. Download from MalwareBytes or FileHippo.
Microsoft Security Essentials - To prevent viruses and protect from them. Download here.
Look Here for more from TechRepublic, where most of this info came from.
