3 Dongle

I have a dongle by 3, and when installed it works for around 10 mins, then freezes the whole computer. I have to then turn off the laptop by holding down the power button. It works perfectly ok on my other 2 laptops which dont have windows 7.
I am not a computer wizard more like a dummy, and help appreciated in how to solve this problem.

Simple instructions required please

Dave UK

Make sure you have the drivers for Windows 7 from the Dongle Company. Make sure you get the 64bit one if you are using 64bit.