Vista Backup failing

Hello all

I've been posting to ...windows.vista.general but have not gotten an
answer to my problem, so that might have been the wrong group. Maybe
this one is better? I'm sorry if anyone feels spammed.. :-)

Here's my problem: When trying to backup my C: drive, backup fails
with an unexpected error. Through the event log, I can see that the
error is caused by VSS, which reports event 12293 with hr =
0x800706be. "Vssadmin list writers" shows that some writers have
troubles:

- System Writer [7 - Failed]
- MSSearch Service Writer [7 - Failed]
- WMI Writer [7 - Failed]

Furthermore, I receive error dialog boxes saying that "host process
for Windows-Services has been stopped and
closed" (might not be the exact words, I tried to translate that from
german...), along with an event log entry of svchost.dll saying that
it's got a "faulty" module swprv.dll.

How do I debug these things, is this even the source of my problem?

I have noticed that the problem *might* be there since I removed
another hard disk from the computer. But, neither removing the drive
from the list of drives supporting restore points (never checked it in
the first place anyway) nor putting the drive back into the PC fixed
anything.

What can I do?

Thanks a lot!
Bernhard