Sorry for posting yet an other problem, but I'm struggeling right now. I get the error message saying that some revision (I'm at loss here) doesn't match a different one. I see that the roots may cause a problem as some of them refer to 2.6, others to 2.7. Should I just delete the MiKTeX 2.6 from the c:\program files? (Sorry if I abuse the LaTeX forum, I'm not even sure if this is the right place to post this issue.)

The error message goes like this:
MiKTeX Problem Report
Message: The page could not be rendered.
Data: gs: Interpreter revision (854) does not match gs_init.ps revision (860).
Source: C:\work3\miktex-2.6\Libraries\MiKTeX\Dvi\DviPage.cpp
Line: 1040
MiKTeX: 2.6
OS: Microsoft Windows XP Professional Service Pack 2 (Build 2600)
SystemAdmin: yes
PowerUser: no
SharedSetup: yes
BinDir: C:\Program Files\MiKTeX 2.6\miktex\bin
Root0: C:\Documents and Settings\chrismsa\Application Data\MiKTeX\2.6
Root1: C:\Documents and Settings\chrismsa\Local Settings\Application Data\MiKTeX\2.6
Root2: C:\Documents and Settings\All Users\Application Data\MiKTeX\2.6
Root3: C:\Program Files\MiKTeX 2.7
Root4: C:\Documents and Settings\chrismsa\Local Settings\Application Data\MiKTeX\2.7
Root5: C:\Program Files\MiKTeX 2.6
Install: C:\Program Files\MiKTeX 2.6
UserConfig: C:\Documents and Settings\chrismsa\Application Data\MiKTeX\2.6
UserData: C:\Documents and Settings\chrismsa\Local Settings\Application Data\MiKTeX\2.6
CommonConfig: C:\Documents and Settings\All Users\Application Data\MiKTeX\2.6
CommonData: C:\Documents and Settings\All Users\Application Data\MiKTeX\2.6