I'm not a huge fan of PM 8.0. Are you using XP? If not, install 7.0. If you are using WinXP, install DiskKeeper on your machine and run a boot time defragmentation on everything (including the MFT fix). This should fix the problem.
On a side note, I don't know what Power Quest's problem is but their support is terrible. Half of their solutions involve running chkdsk with the /f switch and this has never fixed any of my problems that I've ever had with PM 8.0.