if theres anyone out there that has a problem with nv4_disp error stuck in an infinite loop (bsod). i know how it feels.i have spent ages trying to track down the problem. alot of people said it is caused by the nvidia driver which is all wrong. i have done test after test and found compatability issues with spysweeper and nvidia drivers on a major scale. if you have spysweeper on your system then go into add/remove programs and remove it. then go into safe mode. when in safe mode go into regedit,{hot key local machine} go to current control set. look in all control set keys 3/4/5/6/7/8 for this system file SSKBFD.SYS which belongs to spysweeper and has to be removed. this is the problem that nvidia drivers get stuck in an infinite loop. or irq less or equal to errors. delete this key and any other keys that are from spysweeper. only do this if you know the registry. as removing a wrong key or keys could cause serious problems. dont forget the main key or sys.file to remove is SSKBFD OR SSKBFD.SYS. it has to be removed from the registry before you can delete it from the windows/system32. when your happy enough that spysweeper is fully removed from the registry, click start then click search. type in SSKBFD only. and click search wait till you see the file coming up and then delete it. restart your pc straight away . but you might notice a bsod as your shutting down but dont mind it. if this happens just manually power off the sys and you wont get that again. if your successfull that should be the end of your nvidia problem. this worked for me and i havint got the problem since. its 2 and a half weeks and everything is perfect. just tought id share this info with you cause it is a pain getting these bsod. best wishes zenno

if that doesnt work for you then try this... first download DRIVER CLEANER PRO. NOT drive cleaner pro. and install it. dont use it just yet. go into add/remove programs click remove nvidia drivers,and a small screen will come up, only place a check mark on (remove only the following) check mark nvidia display driver.remove it. when done go into safe mode when in there read the instructions in driver cleaner pro. to remove nvidia display driver, scroll down the list in driver cleaner pro for (NVIDIA) only NVIDIA and left click it. then on the right click start. a message will say are you sure you want to remove display driver files or something like that. click yes. when its done it will show you the deleted files. exit driver cleaner pro. if its a dell system you have. then when the above is done. click start then click search all files and folders, type in nv4 click search and it should still find nv4 disp.sys/32. and nv4 sys32 miniport. if you see these remove them. their from dell old display drivers which im sure are conflicting with the newer nvidia display drivers. driver cleaner pro does not notice these files so its best to search them. when removed start the pc up and install your new display driver. hope it works for you. best wishes zenno