I'm running Windows 7 Pro x64 on a Dell XPS M1530, and I've been having issues with the system locking up intermittently. The lockups occur at random and seem to be independent of how many and what programs I am running. Lockups have occured both when the computer is idle and when it's running multiple different programs. The freezing usually lasts between 30 seconds and 3 minutes after which the computer returns to normal and things I attempted to do during the non-responsive period will usually happen all at once. IE usually stops responding completely, music from WMP will cut off, and most other programs will not be usable. The mouse usually stays responsive, but trying to interact with any other programs will usually cause them to stop responding as well. Ctrl+Alt+Del and the task manager are not responsive until the system unfreezes. Perhaps the strangest thing is that the HD activity light turns on solid through the whole thing even though I can't hear the hard drive actually making any noise.
This has been puzzling me for a long time. Thankfully, these forums have recently taught me the usefulness of the event viewer, and I found that "SAVOnAccess" (which I believe is Sophos Anti Virus On-Access Scanning) reported 11 errors simultaneously at about the same time the system froze. I viewed the error history for SAVOnAccess and found quite a few instances where something like this happened. The error descriptions look something like this:
File [...\Device\HarddiskVolume2\Windows\system32\pcwum.dll]'s scan succeeded following a timeout/busy condition - it is being logged in case it contributed to that condition. Process taskmgr.exe, (start check timestamp [ 1ca63104de0b9e7]).or
File [...\Device\HarddiskVolume2\Windows\AppPatch\AcGenral.DLL]'s scan succeeded following a timeout/busy condition - it is being logged in case it contributed to that condition. Process ALUpdate.exe, (start check timestamp [ 1ca5f34c8e4232d]).These two errors were recorded almost simultaneously followed by the system freezing. I couldn't find any other reported errors besides the ones from SAVOnAccess within an hour of the freeze.
I'm running Sophos Anti-Virus v.7.6.13
Has anyone else experienced anything similar to these lockups? Of course the question is if the OnAccess scanning is actually causing the system freezes or if it is the other way around. I'm probably going to try disabling the OnAccess scanning to see if it stops the freezing.