I've been using Spybot 2.1, and have uninstalled it to upgrade to 2.2. When I install 2.2 and reboot, I see this:

Unable to execute file:
C:\Program Files (x86)\Spybot\SDWSCSvc.exe
CreateProcess failed; code 2.
The system cannot find the file specified.

Have any idea what's wrong? I'm using Windows 7. I'm also using Avast Antivirus. I've tried disabling it during the SB install, but it doesn't help. Thanks!