Blank Admin page after installing Quickstart package

I installed J 1.7 Quickstart package for TWN 2. The site works great with the demo content in place.
http://www.microarraying.com/twn2/

However, the admin page is showing a blank screen. This is what I did so far to fix this problem without success:
-deleted cache from browser.
-reuploaded all folders and files from administrator folder in quickstart package.

Could this be due to a bad installation? I would really appreciate your thoughts on this.

Thanks,

Yes, it can be some problem during installation, maybe some files were corrupted. Please enable displaying errors in your server PHP configuration and attach here your server error log to get more details about this problem.

Yes, it can be some problem during installation, maybe some files were corrupted. Please enable displaying errors in your server PHP configuration and attach here your server error log to get more details about this problem.

I fixed it by reinstalling the entire quickstart package. Works good. Thanks!