Windows 7 0x0000007B
Boot into Ubuntu and copy all your data that you need/want. After that you can download Windows 7 and then burn it to a disc, and install it.
If you don't have/know your product key: Download a keyfinder from here, then write down your Windows 7 product key.
There are many articles online helping with the 7B BSOD, here's one
My recommendation would be to boot Ubuntu, save everything that you need (documents etc) from the windows drive and then reinstall Windows 7 to avoid any problems.