How do I reformat an Acer laptop without a recovery disk or recovery partition?

I have an Acer laptop which is running Windows Vista. . . it some how got a virus. I have tried to do a system restore and it did not work. I’ve tried running a recovery option from the BIOS screen and all I keep getting is that Windows Start Up Error thing. How do I go about reformatting the Acer without having a recovery partition or the recovery disks?
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you have a get all the drivers (check acer website and model) then you have to get a Vista DVD with a license to get things done.