Q: i want to restore my iphone but the itunes wont let me

You need to explain in more details. Try this:

Restore your device from an iCloud or iTunes backup - Apple Support

Unable to restore due to...

Find My iPhone is enabled and you are unable to navigate through your phone Settings>iCloud to disable it?

Use If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support to place your iPhone in forced recovery mode and attempt the restore again.

iTunes out of date? Download the latest version here. [If you are running on XP or Vista, you may need to use a PC/Mac with an updated OS]

http://www.apple.com/itunes/download/

iTunes Restore Error?

Get help with iOS update and restore errors - Apple Support