I had a Blue Screen last night, while I was in the middle of trying to download a program (PrevX Home). The error message suggested that there was a paged fault in a nonpaged area, & identified procguard.sys as the file in question. Event Viewer shows that around that time, my McAfee AV shut down unexpectedly, and that there were failures in ADvapi aqnd in the MS Authentication Package. I will check the size of my pagefile later, and perhaps boost it, after googling a few write-ups on the issue. However, is it possible that procguard.sys is corrupted, so that I should re-load it, or re-download PG again? Thanks.