Please help. I was on my laptop the other day and suddenly i got the blue screen that says that there was a problem with atapi.sys. I restarted my computer and it refused to boot up, saying that it couldn't find the Internal Hard Drive. An hour later, i boot up, and it is all normal. Not sure what happened, or why. This has happened to me a couple of times. I have XP Service Pack 3 installed. I have not installed any new software recently. Please advise.