Problem with initializing "Midi Device Manager"

I have Cubase le 4 with a lexicon Lambda i’ve installed about a month ago and have been using frequently.
I am running it on Windows Vista 64-bit
A couple days ago i started recording some midi tracks with an old keyboard through some vst plug ins i downloaded from and everything worked fine. (this might be the problem?)
It was working fine, and later when i tried to open it the initializing screen just stays up, stuck, on
“Midi Device Manager”
I have tried uninstalling and reinstalling Cubase but the problem is still there.
Any advice? Im dying to get back to one of my projects!