First off, yes the physical memory may have issues. There used to be applications out there to block-off bad bits. Haven't check it out recently as memory QC has improved quite a bit.
Second, I would clear the browser cache and de-install as many applications as possible. Who knows what's running in the background.
Third, the registry may have conflicts. Yes, crud happen. That's the most likely. So I would follow spock2k11's recommendation, particularly the bit about malware and the bit about re-installing the OS. Ya I know, there are bazillion patches. But this may be a reasonable investment of ur time.