[CORed]

Try running a disk scan (open explorer, right click on the drive where PA HUD is installed, click properties, click the tools tab, click the "check now" button and check the "scan for and attempt recovery of bad sectors" checkbox. If it is you C: drive, you will have to reboot to get it to actually run the scan. The scan will take a long time. If it comes up with a lot of bad sectors, your hard drive is probably failing, ans you should back it up and replace it before it dies completely. If the problem is a bad sector, you will probably have to reinstall after you run the disk scan. But the scan will make that sector as bad, so the file should be written to good sectors this time.