PC wont wake up from sleep

MY HP wont wake up after its been asleep.

A few times while typing up a legal documents Ive had the following message ......." Your PC ran into a problem .This problem caused your pC to restart."

AND once I was half way through drafting up legal submissions in word and it said it had to restart to repair drive errors

and once when i tried to start it i got " the system BIOS is being recovered"

I think theres something majorly wrong with this Im on HP 500 PC series Model 500 - 007a its a desktop, can anyone offer me some advice

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