Okay, using no password worked. But when I typed in the command, it did not work. So I used CHKDSK. And it said there was one or more errors on the volume. :O
But I don't think it removed them. I still couldn't boot Windows.
do you use have a password in your computer? if so, try using your password when it asks for the admin password
No passwords that I know of in my computer...
can you boot into safe mode, if so try sfc /scannow from the run... dialog.
Um, boot into safe mode? How?

hit F8 while windows is booting, that will bring up the boot menu and choose safe mode.
So did the problem happen on the next reboot after you changed the name?
Yup... I was looking around and decided to use regedit. Then I changed the value of my computer name. Turned it off, went to school, come home and BLAMO! I got this error. Although I did not understand what he said to do in that article. Do you know an easier way?