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Hi, if you want to use the phone in Tanzania you should get unlock code or unlocked handset to use with any service provider, Please try to get unlock code, however if you want to drivers please go to blackberry.com and you can download latest version Blackberry Desktop Manager. and then you can install the software. I hope this information will help you.
Something you can try. Open up Desktop Manager (with the BlackBerry unconnected) open up the Application
Loader. Before hitting next, pull the battery out of the 7750 for 5 to
10 seconds, then quickly put the battery back in, connect the
BlackBerry, and hit next on the application loader. This should
kickstart Application Loader to find the BlackBerry and allow you to
reload the handheld software. So, make sure you have the handheld software installed on your comptuer (which you already do)