You certainly can delete that C:\Windows.old folder, especially since you say you don't want to even open it up, I don't blame you, and have saved all you wanted to save. It also does take up a fair amount of space on the drive too, even though you have a large drive you might as well regain that space. You can get rid of it by using Disk Cleanup.
Do it this way:
Open the Start Menu, click on All Programs, Accessories folder, System Tools folder, and Disk Cleanup.
Click on the Clean up system files button.
If prompted by UAC, then click on Yes.
Check the Previous Windows installations box, and click on OK
Click on Delete Files.
When Disk Cleanup finishes, the C:\Windows.old folder should be deleted.

As for our power outage, "supposedly", according to our power company, ours "should be" restored by midnight MONDAY! So we could be two more nights in a hotel. Funny thing is husband spoke to a neighbor yesterday who said she had a "guarantee" that our power would be back on no later than early this morning...well obviously her "guarantee" was worthless since it isn't on and the torn and shredded wires are still either flapping in the wind or on the ground and broken pole is still broken in half and that half block is still taped off and there are no power trucks in sight.
We will be heading out on vacation, real vacation not forced one, in two weeks, but thanks for the offer!