Another strange thing: The machine has a Run entry in the registry, WRSA.exe -ul. But there is also an entry in Services, WRSVC, which points to WRSA.exe -service. The service is disabled, and I can't enable it. If I try I get a modal dialog that says "0x13d." On my Windows 7 machines this service is Automatic and started.
I'm looking for tips on what to try.
I uninstalled WSAEP from the XP box and forced a group policy update. After a reinstall the service is running. However I'm still getting the complete hang. The box has passed a full suite of Dell memory and system diagnostics.
Best answer by Eldan
Just to follow up, this was a problem with my machine and not with WSA. Tech support was very patient with me ;-)
I found a slightly more recent (2006!) driver for my Adaptec RAID controller and since then have had zero issues.