Originally posted by: wizboy11
Anti-Vir for free.
AOL Kaspersky for free (better then above, but pretty much even)
How did you come to that conclusion? AntiVir (free) is a nice free AV, but there is no email protection, slow server updates, oversized daily nag screens asking you to purchase the full version, and the detection rate falls behind AOL Kaspersky. Another nice feature about AOL Kaspersky is the fact it has hourly definition updates and only 2 running processes that use between 8-15MB of memory. There is an option to scan new and changed files only that will drastically speed up full scan times. However I only recommend setting that option once your pc is clean and you've performed a regular scan. If someone doesn't trust AOL and avoids the Active Virus Shield they can always purchase the full version of Kaspersky 6.0. The bottom line is that they have identical detection rates and use the same engine.
http://www.virus.gr/english/fullxml/default.asp?id=82&mnu=82
Rank
1. Kaspersky version 6.0.0.303 - 99.62%
2. Active Virus Shield by AOL version 6.0.0.299 - 99.62% ~ tied for 1st place!

3. F-Secure 2006 version 6.12.90 - 96.86%
4. BitDefender Professional version 9 - 96.63%
5. CyberScrub version 1.0 - 95.98%
6. eScan version 8.0.671.1 - 95.82%
7. BitDefender freeware version 8.0.202 - 95.57%
8. BullGuard version 6.1 - 95.57%
9. AntiVir Premium version 7.01.01.02 - 95.45%
10. Nod32 version 2.51.30 - 95.14%
11. AntiVir Classic version 7.01.01.02 - 94.26%
12. ViruScape 2006 version 1.02.0935.0137 - 93.87%
13. McAfee version 10.0.27 - 93.03%
14. McAfee Enterprise version 8.0.0 - 91.76%
15. F-Prot version 6.0.4.3 beta - 87.88%
16. Avast Professional version 4.7.871 - 87.46%
17. Avast freeware version 4.7.871 - 87.46%
18. Dr. Web version 4.33.2 - 86.03%
19. Norman version 5.90.23 - 85.65%
20. F-Prot version 3.16f - 85.14%
21. ArcaVir 2006 - 83.44%
22. Norton Professional 2006 - 83.18%
23. AVG Professional version 7.1.405 - 82.82%
24. AVG freeware version 7.1.405 - 82.82%
25. Panda 2007 version 2.00.01 - 82.23%
26. Virus Chaser version 5.0a - 81.47%
27. PC-Cillin 2006 version 14.10.1051 - 80.90%
28. VBA32 version 3.11.0 - 79.12%
29. ViRobot Expert version 4.0 - 76.22%
30. UNA version 1.83 - 75.44%
31. Rising AV version 18.41.30 - 73.60%
32. Sophos Sweep version 6.0.2 - 69.48%
33. Ikarus version 5.19 - 63.22%
34. Antiy Ghostbusters version 5.1.3 - 61.55%
35. Digital Patrol version 5.00.12 - 54.29%
36. Vexira 2006 version 5.002.45 - 52.66%
37. V3Pro 2004 version 6.1.1.2.640 - 52.38%
38. Ewido Premium version 4.0.0.172 - 51.27%
39. Ewido freeware version 4.0.0.172 - 51.27%
40. ClamWin version 0.88.4 - 51.23%
41. E-Trust version 7.2.0.0 - 50.36%
42. ZoneAlarm with VET Antivirus version 6.5.722.000 - 44.65%
43. A Squared Anti-Malware version 2.0 - 43.28%
44. A Squared Free version 2.0 - 43.28%
45. Zondex Guard version 5.4.2 - 41.73%
46. Comodo version 1.0.0.4 - 41.02%
47. Solo 4.0 version 3.1.0 - 40.83%
48. Protector Plus version 7.2.H03 - 37.04%
49. Quick Heal version 8.00 - 33.66%
50. PC Door Guard version 4.2.0.35- 24.13%
51. AntiTrojan Shield version 2.1.0.14 - 24.11%
52. VirIT version 6.1.9 - 21.39%
53. Trojan Hunter version 4.2.924 - 13.44%
54. Trojan Remover version 6.5.1 - 8.00%
55. Tauscan version 1.70.1414 - 7.70%
56. The Cleaner version 4.2.4319 - 6.03%
57. Hacker Eliminator version 1.2 - 1.70%
58. Abacre version 1.4 - 0.00%
AV-Comparitives is another site for anti-virus reviews. The retrospective test is performed on-demand using a 3 month old virus definition database and compares the detection rate over the viruses that have appeared within the last 3 months. Users shouldn't be afraid if products have, in a retrospective test, low percentages. If the anti-virus software is always kept up-to-date it will be able to detect most of the samples. For understanding how the detection rates of the anti-virus products look with updated signatures and programs, have a look at the Aug. 2006 on-demand comparitive tests.