I used to have Nod32 as a resident scanner and Avast4 as a backup one…
if you check this thread ,you will find that an AV like Nod32 loads a vxd file before loading witnodws and it denied access to files for any other AV one the computer (problem solved by Vlk ;D )…
So, now I have Avast4 as my main scanner and Nod32 as the backup one… :wink: