One thing that is likely to help is repairing your Win7 boot loader -- which you could easily do now, had you used the option back when you could get into Win7, to create and burn a Win7 Repair CD.

Alas, the free versions of this are very hard to find (and keep disappearing), so now, you will have to purchase an ISO image from the following link:

Download the ISO file, burn a CD from then, then boot from it.

When it comes up, use the option to run Startup Repair -- and do this three times, that's right, three times. It sometimes takes all three passes to complete the repairs.

After that, you should be able to boot into Win7 -- but your Ubuntu entry is likely to be erased in the process.