Very strange...
It will be interesting to see the setupengine.log file from here:
C:\Program Files (x86)\SAP BusinessObjects\InstallData\logs
In particular, I'd be interested to see if you find this in the log:
06:52:18.257 S-Bank(0x008BE928)::setV create $os.version with 6.1-WORKSTATION
The other idea would be to use the instructions re. MS installer logging from here:
How to enable Windows Installer logging
see if the logs show anything - no idea what - errors?
- Ludek