Hi,
Did you get any error message that system file checker tool wasn’t able to repair files?
If you use acronis to transfer Windows from one drive to the other, this is the most likely reason for the problem. I would suggest you to backup system files and reinstall Windows normally. Follow these steps:
“Back up your programs, system settings, and files”
http://windows.microsoft.com/en-us/windows7/Back-up-your-programs-system-settings-and-files
“Back up your files”
http://windows.microsoft.com/en-us/windows7/back-up-your-files
“Installing and reinstalling Windows 7”
http://windows.microsoft.com/en-US/windows7/Installing-and-reinstalling-Windows-7#section_7