Cubase5 will no longer load! Only as Admin (watch my video)

THIS ONE IS WEIRD! Been using Cubase 5 for months now on Windows7 x64 with no problems what so ever…very stable!!

I came to load it last night and it will no longer load, only in administrator mode! WEIRD
i’m trying not to stress here but not having much luck lol, why the hell has it just decided to do this, any ideas.

Here is my video on youtube explaining the problem…had to make a video, its baffled me!!

cheers http://www.youtube.com/watch?v=B-YL_QACZlM

anybody?..just as baffled as me then lol weird one this!!