My son caught a nasty virus. Can't identify. I just want to reformat his c: and go on with life. However, this virus has made his a: unusable. If I put a boot disc in a: and start the machine, I get a message asking me to insert a bootable disc or select a different boot drive. I have tried more than one disc and have subsequently used the floppies to boot my own machine. Does this sound familiar to anyone?