The themes are for the 7100t. Loading them on the 7520, as you did, may corrupt the operating system.
Go to the Nextel web site and download the latest version of the handheld code. Execute the program.
Find and delete VENDOR.XML on your C: drive.
Start Desktop Manager (with the BB connected) and Application Loader. You should be able to click the Advanced button and tell it to reload the operating system.
If that does not work, get a copy of JAVALOADER, which will allow you to wipe out the BB. Or you can try the Wipe Handheld option.
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