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Greetings Kyprianos,A couple of places to start looking:http://support.microsoft.com/?kbid=330174http://support.microsoft.com/default.aspx?...kb;en-us;321733 <-Server application but if may be helpful.http://www.tek-tips.com/gviewthread.cfm/le.../751/qid/755211http://www.jsiinc.com/SUBM/tip6000/rh6046.htmAlso, before you mess with your current OS, take a look at my earlier post #174088 using Raxco's FirstDefense-ISR producthttp://www.raxco.com/products/fdisr/I had no worries tweaking the heck out of the OS, since I create setup a snapshot just for gaming/tweaking. Not sure of any service that I killed that would produce the error you were seeing, but maybe the above will help.-Todd