once a week a1click cleanes my PC according to my settings, which are simply standard proceedings.

After the cleaning, Microsoft Office 2007 Pro is configuring each time.
This is not severe, only annoying, for it takes several minutes.
What must I do to avoid this?

   When run manually, A1Click gives a warning about removing certain files (it does not warn or remove those files when run automatically at startup).  If you ignore the warning and remove the file, it will cause what you describe.
   I don't know if that is what is happening in your situation or not.  If not, you need to go through the Results of A1Click and figure out what file A1Click is removing to cause that.
   Please let me know what you find out.

normally I use the default settings and now I skipped the folder  'MSOffice  ';
same result. MS office configures again.

   Please go through the Results of A1Click and figure out what file A1Click is removing to causes that.
   Please let me know what you find out.

these are the only files which mention MS Office that are removed:
C:\doc&settings\F.de Vries\App.Data\MSOffice\Recent|index.dat
C:\Doc&settings\F.de Vries\Localsettings\App.Data\MS\Feedscache\index.dat
C:\Windows\installer\MSI30D.tmp
C:\Windows\installer\MSI313.tmp

   None of them are it.
   Please look in the BAK items.  It should be something like, data.bak, opa11.bak, opa12.bak, opa13.bak.

Indeed, this one:
C:\Documents& Settings\AllUsers\AppData\MS\Office\Data\OPA12.BAK

   A1Click should have warned you about that one or not removed it.  I don't understand why it was removed.
   I have changed A1Click now, so that it does not ask about those files but instead just skips them all of the time.  Please get the latest version of A1Click.

Great! It works
Thank you very much
Fred