Let me start by answering your question, the Beomedia 1 runs the embedded version of Windows XP with Service Pack 2
Based on the information so far, it very much looks like a hardware problem.
When you did the restore, did you also restore your music and photo's as well ?
If you only restored the operating system, then I would suggest that you may have a problem with the hard drive.
I think you may need your dealer to check the hard drive for you. There is Windows a utility they can run without damaging the data on the disk which can check for potential disk errors and often recover the situation.