Hi Techspot! I am having some problems with the blue stop screen, which I suspect is being caused by my video card driver. I have noted some details, here below, and would greatly appreciate anyone's help, if possible. The system: Laptop: Sony Vaio VGN-FE31Z OS: Xp MCE 32 bit RAM: 2GB - memtest86+ with no errors video card: nVidia GeForce Go 7600 System defrag approx 4 weeks ago The problem and symptoms: 1. My laptop will not boot to Windows in normal mode (I get the blue stop screen) when my video card driver is installed. 2. Whether my video card is installed or not and I boot in safe mode or normally (only when the driver is not installed, as above), there are numerous short horizontal lines across the screen, which increase in number as I drag windows around the screen/scroll pages. Some of these lines flicker while others are temporarily still; if I refresh the screen, most of them disappear. 3. Whether in safe or normal mode and I scroll a page or drag a window, this is slow and jumpy. The context: A few days ago, I was watching a full-screen video on Youtube, but did not have any other programs or browser windows open (so I assume the problem is not memory related, which is possibly confirmed by the memtest86 result of no errors). During the video, the laptop screen went black for a few seconds (as if it had been turned off, not just a black fill) and then I received the blue stop screen. Unfortunately, I do not remember the full stop message, but I did take a note of the file (nv4_disp), which I assumed to be the nVidia driver given the circumstances and the filename. Assuming this, I simply restarted the machine. On reboot, and after the XP logo and green loading progress bar had completed, the machine went to the blue stop screen again with the error 'PAGE_FAULT_IN_NONPAGED_AREA'. Things I have tried/done: a. Assuming the video card driver to be at fault and thinking that it my have been as a result of a background update, I tried to roll-back the driver, but there were no other versions available. b. I then tried to get the latest driver from the Sony website (apparently, only available from Sony as it is a laptop card and not supported by nVidia), but was only able to download the original driver pack that came with my machine. I did this and updated the driver, but the problem persisted. c. I then searched for another driver on the www and came across laptopvideo2go where I downloaded a later version based on the PCI/VEN and SUBSYS numbers of my card. Unfortunately, this made no difference and the problems as per 1, 2 and 3, above, persist. d. I uninstalled the video card driver and tried to boot in normal mode, which did work, but did not solve problems 2 and 3, above. e. approximately 3 months ago, I opened the machine casing to repair the WiFi switch and gave everything a clean even though it was already very dust-free. I would greatly appreciate any advice or potential solutions/further testing to try. Many thanks, James.