Partitioning may have corrupted some system files,
Did you partition after installing it.?
You should not partition before installing Windows 7 too, it should be clean install on full empty HDD add specified in the tutorials.
You may have to reinstall the OS once again by following the tutorials promptly.
You can also do a: sfc /scannow
from CMD as administrator,
Open command prompt by typing CMD in RUN program, open as administrator.
Check for any integrity violations,
Regards,