Spybot crash at startup & Business installation

[KellyPCorc]

I've got a couple of problems with Spybot, on separate computers.

On this one: The program (2.0) worked fine when I installed it, but lately I've been getting a "Procedure Entry Point not found" error when I try to start it up, regardless of whether it's an automatic startup with Windows or if I try to start it or the updater manually. Haven't seen any documentation about this - how do I fix it?
(Windows 7 32-bit, Dell Precision 470)

On another system: I was helping out a friend by installing some security software on her computer, but when I installed and tried to run Spybot, it gave me an error like "your business subscription has expired." Apparently it was previously installed with the paid version for some reason. It's a personal-use-only system, so how would I disable this "business mode" and enable basic home access as usual?
(Windows XP 32-bit, Toshiba laptop)