If you are having trouble with Partition Magic 8.0, error #27 cannot lock drive, first shutdown all applications, including those in the task tray. Then get a command window, run chkdsk /f, answer yes to unmount volume and if applicable, no to running chkdsk upon reboot. Wait like about 3 minutes for all the file handles to be released, then run chkdsk /f one more time. The second time, chkdsk should run without the question about running upon reboot. Now, you are reading to run Partition Magic again.