This is most likely the result of a video issue. Partition Commander can be installed with a different graphics resolution (by using a -v switch) that is more compatible with certain video cards.

1 Insert the PC6 CD ROM. If it auto-starts, close the program. 
2 Open the RUN box found in the Windows Start menu. 
3 In the RUN box, type: d:\install\scin -v install and click OK (where D is the CD ROM drive letter). 
4 Complete the Partition Commander installation normally.

It maybe necessary to run certain applications in the future also with the -v switch. Example: scin -v

It is also possible to update Partition Commander with the -v switch. Example: pc605_us.exe -v