When the hard drive fails. Are you able to tell more? This as a minimum when you post here -> "Note: If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. "

The task manager issue can indicate malware. Or registry cleaners. Read what Grif notes at the next link and try it in Safe Mode (noted in his writing.)

Read http://forums.cnet.com/5208-6142_102-0.html?messageID=3105025