McShield.exe
(McAfee Network Associates)
McAfee On-Access Scanner for Windows NT4/2000, present in McAfee VirusScan 4.x, McAfee NetShield 4.x, and in the Business Management McAfee Protection Suite for networks. This task virus scans files in the background as and when you access them.
Recommendation :
Essential for the proper protection of your PC against viruses leave alone.