ACCTUALLY

2 is ONLY bad for a common user...

because they attack each others defanitions and then neither program know what a virus looks like +_O

you CAN install 2 but you must configure BOTH to ignore the others .exe's and it's location (IE c:/program file/xxxxx)

the advatage is that differant programs use differant scannin engines the down side is... it's SLOW

i'd take off AVG anti-vir is WAY better


or you can be cool like me an use NONE

(but then agein i don't think there is any viruses for x64 vista... yet)

also being CARE-FULL about what you do and you should be fine with none/one