The CMOS forgets its settings even with a new battery. Program size keeps changing. Can't access the hard drive after booting from a floppy. Programs or Windows takes longer to load. Clicking noises from the pc speaker while typing.
Files keep getting corrupted.
Your hard drive becomes a single encrypted zip file. You start to find strange files on your drive. Letters fall to the bottom of the screen. Hard drive keeps running out of free space. The drive light flashes for no reason.