you have a old version of McAfee V-shield and it used to cause this quite a bit on nt systems, have not seen this error in a couple of years. my sugestion would be remove mcafee completely and use the new free version of avg, you would have better protection. if you want to repair what you have use the link below.
http://www.tek-tips.com/viewthread.cfm?qid=72388
if you want the free avg(remove mcafee before you install).
http://free.grisoft.com/freeweb.php/doc/1/
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