I can't take it any more. I've had a GeForce 8400GS on my windows XP PC with SP3 for some time without an issue. The other day I switched on to the dreaded blue screen quoting the nv4_disp error; and after some research, finally got into safe mode and uninstalled the driver. I installed the new driver from Nvidia's site, and restarted, to the same problem. I am not remotely techy and find a lot of internet advice and references simply confusing. Can anybody offer a solution in layman's terms, to get my PC working again, that wouldn't involve having to buy new hardware?