Which network driver? Also, you should update the system to the current release 6.4. Security is one important reason but also the latest driver might fix the issue. [by toracat]
I have a question on ATI Drivers. From what I understand there is 2 ways of installing it. One is to go to Hardware drivers that's under System->Administration and activate Restricted ATI driver. Second way is to go to amd.com and download latest driver and then install it.