Posted 17 June 2006 - 09:10 PM
c000021a is a security error that forces the shutdown of certain processes that Windows can't live without (such as WinLogon or CSRSS.EXE) http://www.osronline.com/ddkx/ddtools/bccodes_45uv.htm
The most commong cause is third part software. Have you installed anything recently that might be associated with this? I noticed the reference to ARC in your post - that might be the ArcSoft Software suite of photo tools. Could it be ther problem?
I'd suggest checking your Event Viewer for errors (How-To located here: http://www.bleepingcomputer.com/forums/t/40108/how-to-use-event-viewer/
Also, search your system for these files - *.dmp and *.mdmp
If you find them, here's a link on how to debug them: http://forums.majorgeeks.com/showthread.php?t=35246
Don't worry about all the stuff in them - you're just looking for the filename of what caused the error. Just let us know what filenames you find and we can work from there.
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