I like both avast and avira. I think avira does a bit better job but uses more of your system and gives you anoying pop ups every now and then to buy teh paid for version.
Malware bytes also does a pretty good job of removing infections.
Combofix is great for really bad infections but has been known to blow out some system files and OSes every now and then lol
1. i7920 @ 4.0 @1.25v, 6gb 2000mhz Trident, Enermax Revolution 1050Watt, DFI X58-T3eH8, GTX295 Co-op FTW, 2 x 500gb HD
2. Q6600 (G0) @ 3.5, 4 gb Corsair Dominator ddr2 1066, pcp&c 750, DFI LP DK X48-T2RSB PLUS, 2 x 4890 @ 950 & 1050, 250gb Barracuda x2 (Raid 0) 500gb Barracuda (storage), X-FI ExtremeMusic, JVC HARX 700, ATH AD-500
3. e5200 @ 4.1, 2gb crucial Ballistix ddr2 800, Crapy Dynex 500, DFI LP JR P45-T2RS, MSI NX8800GT 512M OC, 80gb HD, 1Tb .12
4. Gateway fx p-7805u