RENDERING ERRORS with Rush on PC

See attached error - same when ever I try to export an existing project on my PC, YouTube or anywhere. I have exported earlier versions several time before. I have tried everything recommended in various blogs - nothing helps. Tried going back to earlier Rush versions, reinstalling display drivers etc. I have removed all media from teh timepoint identified in the error message (see attchment) but the same error messgae and time point keeps coming up. I have spent more than a day on this and must say the software seems unusable at this point. Can someone with the right skills look at my Rush project and tell me how to fix this? Otherwise I will have to start over again on another software product!