Welcome to Seven Forums mchris4all. Try booting to Safe mode with command prompt Safe Mode
When the command prompt loads, type: sfc /scannow
and press Enter
Let the scan continue. You might have to run it several times
See if you can now boot correctly. If not, there are other options including Startup Repair, and ultimately a Repair install, which will save all your programs and settings.
I would suggest a System restore point from the command prompt in safe more, but you apparently had issues with theming that the SFC may just fix. A Guy