Problems restoring iPhone

I can't restore my iPhone. I've done the list for restoring my iPhone twice, and "error 21" (or something lke that) appears. I want to restore because i want to "start over". One of my sisters friends jailbroke it and said everything would be much better. I didn't think it was a good thing to do, but let her do it. Now i regret as #$%(/&$!!!! I want to throw cydia far, far away and just get rid of all the crap. Anyone who knows what to do? I've upgraded the software on my mac, installed the latest version of iTunes, tried to put my iPhone recovery mode and then restore, but nothing will work. Please help me! :-(
btw, I want to DELETE all my stuff. I want to set it up as a NEW iPhone, but nothing will work.

One of my sisters friends jailbroke it and said everything would be much better. I
If your phone is jailboken, you can no longer get any support from Apple or in this forum. Restoring the phone does not always work to "start over" with jailbroken phones.  If you are getting error 21:
Error 20, 21, 23, 26, 28, 29, 34, 37
These errors typically occur when security software interferes with the restore and update process. FollowTroubleshooting security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
iTunes: Specific update-and-restore error messages and advanced troubleshooting

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