I've got you covered here, bud! I just fixed this on mine for the EXACT same reason. Two things you'll need to download after a fresh install with an OEM Windows 7
1. KB3138612 Full File Name = Windows6.1-KB3138612-x64.msu
2. KB947821 Full File Name = Windows6.1-KB947821-v34-x64.msu
Run the first one first, and it will just sit there and spin like you said before. End that task via the Task Manager, then look at your C: drive and you'll see an new folder "b3763f80e7a1a25a408b9de2"
Open up CMD as an admin and type in the following commands:
CD C:\b3763f80e7a1a25a408b9de2 (or whatever your folder file name is) then press ENTER
Then type
pkgmgr.exe /ip /m:Windows6.1-KB3138612-x64.cab and press ENTER
After 30 seconds or so you'll get a message saying that packagemanager needs to reboot the machine. So reboot.
When it comes back up, click on your second file that you downloaded, the SUR tool (KB947821) and cancel that from the task manager.
Go into the C: drive and you'll see a second folder 3bbb367be2ad6debb7d77f70
Open up CMD as admin again and type the same commands:
CD C:\3bbb367be2ad6debb7d77f70 (or whatever your folder file name is) then press ENTER
Then type
pkgmgr.exe /ip /m:Windows6.1-KB947821-v34-x64.cab and press ENTER
This one may or may not give you the reboot message, but a way to know for sure that it installed is to go into your Control Panel and look at your installed updates. If you see KB947821, then you're golden. Reboot the PC for good measure, and when it comes up, go into your Windows updates and click Check for Updates, and it'll pull everything up for you and get the ball rolling!!