Which version of Firefox are you using and which version of Reader are you trying to install? It will be easier for others to help with this info.
firefox v. 3.0.11
adobe reader v. 9
I was loading adobe and I think I interrupted the load.
It's now loaded and working, but every time I open firefox I get that windows error message, noted above.
I'm not sure what the root cause of the problem is but I believe you are experiencing an issue with the Adobe DLM Firefox plugin for GetPlus. I have found a Mozilla support article which explains how to go about diagnosing plugin issues and how to disable/reinstall the offending plugin:
Let me know if this helps otherwise I will keep looking for a possible solution.
Thank you thank you - these instructions worked perfectly. The offending plug in is now gone. No further problems.