It is not likely they are using the 64bit version, I think the issue is with firefox, because it did not seem to happen in ie, but I only use firefox. i am also using peerblock 1.2
Hi!
It appears that new version of Avast is using a certificate with SHA256 hash algorithm for Web/Mail Shield protection. Unfortunately Windows XP SP2 doesn’t support that algorithm, Microsoft made it available in SP3 (see here - section “Detailed Operating System Support”).
Regards