AntiSpyware has encountered a critical error (Error 101)

[Donna Maria DiGiacomo]

Error Loading Microsoft AntiSpyware
Warning, Microsoft AntiSpyware has encountered a critical
error (Error 101). Please restart Microsoft AntiSpyware
again. If you continue to experience this problem, please
contact Microsoft technical support at
(e-mail address removed) for immediate assistance.

- Windows XP service pack 2.
- My "installer" service is running (manually).
- I un-installed & then re-installed.
- Same error.

Any ideas for a wayward soul?