I install the driver for the bluetooth conector but doesn´t happens anything, only I have this message: ´Bluetooth Network. A network cable is unplugged´

What must I do ?

What is your goal here? Are you trying to sync your Blackberry via bluetooth?
If so, you can't without BES 4 and the proper bluetooth drivers on the Windows side.
There's really no reason to pair your 7290 to your laptop. There's really nothing you can do with it.

I want to install Opera Mini in that Blackberry. I´m going to search BES 4. Thanks.

You can't install software via Bluetooth, even with BES.
BES is Blackberry Enterprise Server. It's probably not for you.

Do you have a Blackberry Data Plan on your acocunt with your wireless provider?
I think you can install OTA by going to mini.opera.com using your browser on your Blackberry.

I´ll try more things and I´ll search about BES but at least I want to synchronize data between my Blackberry and PC, and I have a strange thing with the bluetooth conection. When I conect my bluetooth USB in my PC the PC say´s me that a network cable is unplugged. Why ? I didn´t use cables. Do you know what´s happening ?