This error happens every time I run parallels for 1hr+ or run an antivirus scan or adaware scan. I submitted an error report #210428. I have looked at other forum comments but none seem to be what I am finding. Please advise. The last time the error happened it threw Windows Vista into a blue error screen. "Unable to access Hard Disk 1 An error occurred when accessing the hard disk. Error ID: Input/output error."