Sounds like a driver conflict.
Is your analog fax modem on the Windows XP HCL list?

Signature
Russ Valentine
[MVP-Outlook]
> During a boot the system would lock up when it loads
> fxssvc.exe. I set fax services to manual start and the
> system will boot up. When I turn on the fax services the
> system locks up again. I have tried removing fax and
> reinstalling without positive results.
Rick - 12 Apr 2004 15:11 GMT
The fax worked last week and I made no changes to the system and now it fails to work. I will check the Windows XP HCL list.
Rick - 12 Apr 2004 15:16 GMT
my modem is listed as compatible in the list.
Russ Valentine [MVP-Outlook] - 12 Apr 2004 20:08 GMT
You're the only one who could have a clue what changed on your system, then.

Signature
Russ Valentine
[MVP-Outlook]
> my modem is listed as compatible in the list.