If I get another virus
Sounds to me like you mean "When". 
IMO, these 3 things are axiomatic:
1) free AV is worth about what you pay for it.  
2) And even the best commercial AV doesn't stand a chance if you browse stupidly. 
3) But even without 
ANY AV, a fully patched system can stay clean for a LOOOOONG time if not used for social networking sites, pr0n, or P2P. 
Hence, the large discrepency between users and their rate of success with /evaluations of various A/V packages. 
<S>