blackra1n fix with iTunes 9.1
For iPhone users who are using blackra1n to tether jailbreak your iPhone, and you have updated your iTunes to 9.1, you will noticed that blackra1n will run into some errors.
To fix the issue, simply drag and drop blackra1n into C:\Program Files\Common Files\Apple\Apple Application Support and run blackra1n directly from the folder.
Good and simple workaround.
No need to download any patches like blackbreeze.