Drivers? Internet problems

Ok so recently I got myself a new motherboard and new case.
However because of my customization of Windows XP Home Edition the PC did not like to try and load up Windows from my old hard drive.

I therefore formatted my Hard drive.

I have installed Windows XP again
And all my hardware

These are the addons that I have plugged into the PC via PCI or PCI Xpress
Creative Professional E-MU 404 Sound Card
Nvidia GeForce 7600
Netgear Wireless WG311v3


I have all the drivers for these installed
After I browsed these forums and discovered that the Netgears drivers disable the welcome screen to XP I quickly fixed that

But there is another problem.....
After I have connected to the internet for about 20-30mins the connection all of a sudden disconnects.
BUT
According to windows its still picking up a connection on the wireless
However when I open up Firefox it cannot connect to a server and the same with MSN Live Messenger

And after about 2-3mins of this the right click gets disabled on any of the windows programs on the Taskbar Tray and the computer refuses to load up any Windows programs.

I have Avast Anti virus and it does not seem to be detecting any virus's.

This is a real confusing one to me.
Would anyone be able to help me out on this one?