Acer Aspire 6930 Laptop will not boot up

I believe I've contracted a virus which has wiped out my boot sector.I can not find the recovery or system install disk. I have started the laptop and tried pushing/holding down the F2-F12 keys individually after each attempted restart. I've even tried using the Alt F8-F12 fucntions individually after each restart. After each try all I got was a black screen with a blinking dash in the upper lfet-hand corner. Someone please help me get back into my system.

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