Hi all , i have started getting this prob every time i start up my pc, i use to have to press ctrl,alt,del on start up which tells me im loading the correct log on page, now its not there anymore so i put my password in and it boots up ok untell every thing is loaded up . Then i get a window that says ( windows log on user interface has stopped working ),,, dose anyone know what this is & will it affect my pc & how do i fix it,,, thanks all,,, here are my desktop's specs

Mainboard : Packard Bell BV Cuba MS-7301
Chipset : VIA P4M890
Processor : Intel Core 2 Duo E6320 @ 1866 MHz
Physical Memory : 2048 MB (2 x 1024 DDR2-SDRAM )
Video Card : Nvidia Corp NVIDIA GeForce 8500 GT
Hard Disk : ST3320820AS (320 GB)
DVD-Rom Drive : ATAPI DVD W DH16W1P ATA Device
Monitor Type : AOC International N19W - 19 inches
Network Card : VT82C570 MV IDE Controller VT6102 Rhine II Fast Ethernet Adapter
Operating System : Windows Vista ™ Home Premium Home Edition 6.00.6000
DirectX : Version 10.00
Windows Performance Index : 4.1
Norton Internet Security 2007
Spyware Doctor

I'd first suggest trying these free, online scans to see if your security has been breached by malware:

http://onecare.live.com/site/en-us/sandbox...s%2Fdefault.htm
http://housecall.trendmicro.com

Thanks for the reply usasma, but these scann's are not vista compat. I have scanned my pc in safe mode with Spyware Doc, Superantispyware & Norton Int Sec and found nothing, there are also no visable sign's of malware, like an unotheriseed program trying to get in or out & no prog's on taskmanager useing a lot of power & i opened my web browser and nothing got hijacked, i've had a couple of nasty trojans befor from p2p sites and my pc is not acting like its got anything nasty at work,,,, i'll keep checking though,, once again thanks,,,,,Ian
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The first one is Vista compatible but must use IE in order to work. The second one also works in IE (I didn't bother to install Java into my Firefox).

I recommended the scans because malware can corrupt the protection that is installed on your system and make it give false results.

Another issue could be the removal of malware - it can cause as many problems as the viruses themselves. This is because the viruses damage critical Windows files that the anti-virus programs can't repair. The fix for this is a Windows repair - here's a link for that: http://www.bleepingcomputer.com/tutorials/tutorial148.html

Thanks for the reply again usasma, i was using firefox, i'll try ie insted, i did an error check on the hard drive then restarted it a couple of times an it was ok but i'll still run the checks on your links. As 4 my other post i think it's probley related to this one, i've put the three finger salute back on aswell on start up and all seems to be ok,,,, thanks ,,,,Ian

Hi usasma, i ran the win one care prog that you recomended, it found no bugs but there were a few issues with the system, so it created a restor point and fixed them for me.
Everything has been fine since, apart for the sleep mode thing which i think is a seporate issue with vista as i googled it & it seems to be a common problem with this addition, they say wait for a fix by microsoft,,,,, but thanks for your help once again,,,,,,Ian

I'd recommend that you update your nVidia video drivers with this latest driver: http://www.nvidia.com/object/winvista_x86_163.69.html