VIRUS changing date and time automatically to 2090

Sir,

i have symantec server in my setup it is updated, today after noon i got a problem that in two computers 276.exe has encountered and need to close, in this computers the date and time automatically changed to 2090 JAN. so when i scanned with symantec it did’t find any thing on suspected computers. please help me what is this issue. is the virus plaing like this or some other issue. if it is virus how can find manually this virus.