I guess, you are right with the "C" that's the proeblem..

The complete error message is:
an exceptional error O6 occured on adress 2087:001D262
you can type any key or
strg-alt-del to restart the computer.

(any key does not work. Restart is the only possibility ending up in the secure mode next time)

The whole computer was working with windows 98. All drivers were already installed. The cd was working as well.
In the device manager I cannot find any errors (strange,he)
There must be a trick to start a cd although the unit is not original.
Or not?
Is there a possibility to repair/reinstall something out of the secure mode from teh windows side?

Thanks
Chris