problems with deleting my wtf folder.

You might also be able to delete the WTF folder in Safe Mode:

http://us.blizzard.com/support/article/safemode

Or you might have to create a new User Account in Windows, and delete it when you're logged on the new User Account:

Windows Vista & Windows 7:

• From the Start menu, select Control Panel.
• Double-click User Accounts, and then click Manage User Accounts.
• Click Create new account. Enter a name for the account, and then click Next.
• Click Computer administrator, and then click Create Account.

Windows XP:

• From the Start menu, select Settings, and then Control Panel.
• Double-click User Accounts.
• Click Create new account. Enter a name for the account, and then click Next.
• Click Computer administrator, and then click Create Account.

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