OS freeze on CompaqCQ60

Hello everyone,
I’ ve got three problems:
the first is my horrible english:?. Sorry, if you can’t understand something ask me to write it in a different way.

I installed openSUSE 13.2 a few days ago, on an old Compaq Presario CQ60, with an Nvidia Geforce 8200 M G. I also installed the recommended Nvidia drivers.

The first real problem is that the OS frequently freezes: sometimes also appears horizontal lines on the desktop.

The second problem is that when I use Wi-fi and another laptop (using Windows 8) is connected to the same network, after a pair of minutes the wifi network disappears on both laptops, and it takes a pair of minutes to restore. This problem disappears if I use ethernet.

Someone can understand what I wrote :smiley: and can also help me? Thanks!

(PS: same problems with Ubuntu and Linux Mint)