I am using a Compaq EVO 510 with WinXP Pro. When I try and use the WinXP boot disk to boot into DOS I am unable to use the C: drive. The error message Invalid Drive Specification is given. I need to get access to the C: drive from DOS to replace a corrupt dll file as the system won’t boot into Windows. The hard drive is confirmed to be fully functional after using the IDE test and I was wondering if there is a work around or solution to this problem. I have tried MSDOS, Win95, Win98, WinXP boot disks but to no avail B-(