Hello there! AhellHound Welcome to the Seven Forums!
One thing I could say here is that if push comes to shove you could perform a repair install of the present Windows installation in order to repair the boot sector. Repair Install
The problem may not be as easily solved however if it is found that the boot sector ends up seeing a "boot sector unwritable" type error. The first thing you may have missed when trying the MS instructions however is a possible need to run the Startup repair tool a few more times to insure it finishes any repair it could make. IF and I say if the drive is seeing bad sectors at the front end you may be in for a disappointment however.
As of late for a friend on an older build with a drive now 6-7yrs. old in fact while it can still be seen at times with brand new drives as well as ones worn from use the Disk Check tool was run while booted live from the previous version's Vista dvd to run the "chkdsk c: /f" command at the command prompt option when suddenly seeing that type of error and Windows constantly failing to boot even after the last known to work had been used the last time the desktop was seen. A new drive had to be ordered.
That's the worst possible end. You may want to run a hard drive diagnostics tools to either confirm or be able to rule the drive out as the problem before anything else at this point. If the drive is found to good and troublefree the rest would be software/OS related which is better.