Thanks for the responses to my "Disk Check" problems. That's fixed. Now I have another problem. I regularly copy files to one of my flash drives and all of a sudden my Power Desk crashes after a few seconds into "edit/Copy". The same thing happens with my Windows Explorer. I have tried uninstalling, deleting all temporary files, etc., then reinstalling, but to no avail. Any ideas? Obviously there's a conflict somewhere, and my Sys Info Error Reporting file gives me "Application Error Faulting application pdexplo.exe (or explorer.exe ... faulting module kernel32.dll, version 5.1.2600.5512, fault address 0x0000cffd. #x000d; 
." My computing skills are not up to fixing this - Any wise soul out there willing to help? Richard.