arkhi: yes, about 300MB log file
now I tried my iso in a VM. No problem upgrading from 7000 x64 to 7048 x64.
I will try to remove as much hardware and anti-virus until I found whats i giving me errors
edit: finally the logfile opened.
2009-03-11 13:49:12, FatalError [0x090001] PANTHR Exception (code 0xE06D7363: <unknown>) occurred at 0x000007FEFDA3AB7D in C:\Windows\system32\KERNELBASE.dll (+000000000000AB7D).
last entry in setuperr.log. anyone knows why it occurs