If you are using the Curve on TMo and using OS v18.104.22.168 then you will not get a Browser. The OS needs to be downgraded to 22.214.171.124
You can get it from here: BlackBerry from O2 - Help and support
Delete any other OS versions you may have installed to your PC by going to Control Panel, Add/Remove programs.
Then do the following:
Download and install the OS from the above link.
Delete vendor.xml file located in c:/program files/common files/research in motion/apploader
Plug in BB, open Desktop Manager and run application loader. It will notify you that a downgrade will take place. Finish the loading.
When it's done, go to Options >Advanced Options >Host Routing Table click menu and select Register now.
One thing to note, if you are new to Blackberry you'll need to make sure that you have a "Blackberry" Data Plan on your account.