Try getting to CL with f8 boot...
...and rename then delete this mobsysb.exe...which is not a system file that I'm aware of.
See if that gets you in so that you can trace where that came from and run msconfig and/or regedit to keep it from running at startup.
You were born...and so you're free...so Happy Birthday! Laurie Anderson
[link|mailto:bepatient@aol.com|BePatient]