Blocked, or not allowed due to incorrect Win7 version?
Can you screenshot the error?
Also, if it is a versioning problem please call CS at this number for help in obtaining the download and key for the correct version (*not for copies bought in stores, only for the on-line purchases/Downloads through Microsoft/Digital River Student Pre-release program):
1-877-248-1220
I got it from a store, so back to them I go.