Allright thanks for your tips. Didn't work anyway, but I solved it:
1. Delete the steam.dll, so steam replaces it, on the next startup.
2. Apply all Windows Updates
3. !IMPORTANT! Run iw4m.exe as Admin, if you are using Win7
Could also be related to the fact, I am using a 64-bit system.
Hi Guys,
if I start iw4m.exe and enter my credentials, the console opens and an error message appears:
"Error during initialization:
Fatal error (0xc0000005) at 0x693165e8."
The link to the minidump: http://www46.zippyshare.com/v/92811777/file.html
Hope you guys can help.