Hi,
Here are some common problem areas.
1) Services running on source interrupts converter imaging - stop as many non essential ones e.g. antivirus etc.
2) Mirror exists on source volume - break mirror.
3) Source volume corrupt - run checkdisk
4) Source volume badly fragged - run defrag
5) Destination is over a UNC path - map a drive letter instead. Use local drive if possible.
6) Diagnostic partition or other partition exceptions the process - delete the partition if possible
7) Dynamic volume on source boot volume results in BSOD on VM boot - run OS same version upgrade by selecting install first then repair on the previous windows detection.
8) Running old version of converter