Problem running aspnet_regiis.exe

When I run aspnet_regiis.exe from C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322 where it lives, I get an error "invalid arguments" REGARDLESS of what arguments I give it, e.g., -i, -lv, -r, etc. It then proceeeds to list all the "correct" arguments, including the above!

This is on XP Pro (thus IIS 5.1) with VS 2005 installed.

Googling this I've seen other people report this, too, but, strangely, I haven't seen the explanation or fix yet.

Thanks in advance for any tips or pointers!

I think I found the problem. I went into Task Mangler and killed any process associated with IIS and the problem went away. Odd sort of error for that, though.