Try a different computer as said above, make it a good computer at that (above 1GHz, 256mb of RAM). If that works, then it's your PC's problem. When Sonicstage has problem with PC, it is most likely that your PC is too slow, maybe reformat as it could be a software problem, since it worked before. If using different computer doesn't work, go to the local Sonystore and seek advice. Here in Canada, if that happens, they will exchange it.