Try System Restore to before you tried to add the blue yonder account.
Click the Start button.
Point to Programs, point to Accessories, point to System Tools, and then click System Restore.
Choose Restore my computer to an earlier time, and then click Next.
Click a day on the calendar, click the restore point description, and then click Next.
Make sure you have closed all your files and open programs, and then click OK to close the dialog box.