Search the archives for messages about Windows XP. Checking the hard disk surface for errors is a good move. You also might think about defragging the Poser hard disk. Also, you have the option of running a program under a different version of Windows. I would use the program compatibility feature to run it under your old version of Windows. If it runs under that but not under Windows XP, then it is XP problem. If it doesn't run under either Windows program, it is probably a hardware issue. Sometimes when people switch from one version of Windows to another and keep old hardware, they neglect to update their device drivers. In this case, it sounds like you got all new hardware (except the Poser drive). (There was one error message in the archive about a size limitation under FAT32 but it didn't seem to apply.) Does the Poser hard drive run on the same disk controller as the C: drive? If it runs on its own controller card(like with SCSI), you might need to update the device driver for that card.