Office setup problem

[jering]

Domain: Windows 2003
Client OS: Windows XP SP2
Application: Microsoft Office 2003

Suddenly we have started getting a weird problem with Office on new Windows
XP clients. We install Office as an administrator and all applications works
perfectly normal.
When we log on with a user and launch i.e. Microsoft Word 2 messages pops up:
No. 1:
Microsoft Office Standard Edition 2003
Error 2503. An internal error occured.
Contact the IT-department if you need assistance.

No. 2:
Microsoft Office Standard Edition 2003
Error 2502. An internal error occured.
Contact the IT-department if you need assistance.

The following is listed in the application-log afterwards:

Event Type: Warning
Event Source: MsiInstaller
Event Category: None
Event ID: 1001
Date: 09.05.2007
Time: 22:36:50
User: DOMAIN\test.user
Computer: LAB-400
Description:
Detection of product '{90120414-6000-11D3-8CFE-0150048383C9}', feature
'WORDFiles' failed during request for component
'{1EBDE4BC-9A51-4630-B541-2561FA45CCC5}'

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


Event Type: Error
Event Source: MsiInstaller
Event Category: None
Event ID: 10005
Date: 09.05.2007
Time: 22:45:58
User: DOMAIN\test.user
Computer: LAB-400
Description:
Product: Microsoft Office Standard Edition 2003 -- Error 2503. An internal
error occured.. ( ) Contact the IT-department if you need
assistance.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7b 39 30 31 32 30 34 31 {9012041
0008: 34 2d 36 30 30 30 2d 31 4-6000-1
0010: 31 44 33 2d 38 43 46 45 1D3-8CFE
0018: 2d 30 31 35 30 30 34 38 -0150048
0020: 33 38 33 43 39 7d 383C9}


Event Type: Error
Event Source: MsiInstaller
Event Category: None
Event ID: 10005
Date: 09.05.2007
Time: 22:46:01
User: DOMAIN\test.user
Computer: LAB-400
Description:
Product: Microsoft Office Standard Edition 2003 -- Error 2502. An internal
error occured. ( ) Contact the IT-department if you need
assistance.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7b 39 30 31 32 30 34 31 {9012041
0008: 34 2d 36 30 30 30 2d 31 4-6000-1
0010: 31 44 33 2d 38 43 46 45 1D3-8CFE
0018: 2d 30 31 35 30 30 34 38 -0150048
0020: 33 38 33 43 39 7d 383C9}


Event Type: Information
Event Source: MsiInstaller
Event Category: None
Event ID: 11729
Date: 09.05.2007
Time: 22:46:01
User: DOMAIN\test.user
Computer: LAB-400
Description:
Produkt: Microsoft Office Standard Edition 2003 -- Configuartion failed.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7b 39 30 31 32 30 34 31 {9012041
0008: 34 2d 36 30 30 30 2d 31 4-6000-1
0010: 31 44 33 2d 38 43 46 45 1D3-8CFE
0018: 2d 30 31 35 30 30 34 38 -0150048
0020: 33 38 33 43 39 7d 383C9}


Things I`ve tried:
-Installed SP2 for Office 2003
-Installed with a *.mst file with the option "Run all from local computer"
on every application
-Moved both the computer-account and the user-account to a new OU with
"Block inheritance" to ensure that no GPO is the source for the problem.

The same problem occurs with Office XP and Office 2007.
This is related to new Windows XP SP2 installations. Office works fine on
earlier installations.

I`m really starting to get stuck on this one....any suggestions?