Motorola Droid X :: Change Screen Lock

I have a Droid X. I was previously employed by a company that used Exchange Server and Active Sync and I added my company email account to the Droid X. This forced me to use a 4 digit pin as required by the mail admin of the company. I no longer work for this company, and deleted the active sync account from my phone (and no longer have access to it by any means). The security settings for the PIN. When I check SETTINGS -> LOCATION & SECURITY -> CHANGE SCREEN LOCK -> CHANGE SCREEN LOCK the options, "None" and "Pattern" are grayed out and not selectable. When I look under SETTINGS -> LOCATION & SECURITY ->SELECT DEVICE ADMINISTRATORS the device administrator is listed a "Corporate Sync" and I cannot change or delete this.