I've had my BR-600 for almost 2 years with no problems at all, but the other night I plugged it into my computer to export a file and was greeted with a message saying something like "Windows Vista has found problems with this product. Scan and fix? (recommended)". So I clicked "scan and fix" and now the file with the music tracks has completely disappeared. The Roland file is still there, but when I click it the window "choose the programme you want to use to open this file" appears.

Could anybody please help me out with thise problem?