Windows 7 shuts down after start up.

Window 7 shuts down after start up. If I go into safe mode all is good. Although it hangs for awhile at "avgArDisk.sys". So I uninstalled AVG. Now it hangs for a bit, still in safe mode, at "classPNP.sys". Is it normal to hang at any of these during start up in safe mode? My first thought is the 700watt PSU. Now thinking bad video card. MB is Pegatron M2N78-LA and vid card is a Radeon XFX 6870 2gb. Is there a way to test vid card? Is there a more powerful video card to upgrade with? System is old but has served me well.

Hi, Sorry you have reached the limits of the system and no can not get another card. Legacy Drivers regardless if find something. 

Suggest put it in a corner and reminisce.  A 2013 system does not have the drivers to keep up with modern anything (more or less as I have one & only because paid big bucks and built it myself). 

I would suggest you look here : https://www.sevenforums.com/    

classPNP.sys : https://answers.microsoft.com/en-us/windows/forum/all/windows-7-boot-stalls-at-classpnpsys/60391978-7fba-4afa-8c6b-c2dd8fc316d9

Drivers, drivers, drivers. Is your issue.

G'luck with it.

Edited by Pkshadow, 23 June 2025 - 10:33 PM.

You are not alone with MS not allowing a wack of systems to go to Win11 since Win10 is EOL.

You can do this and possibly have a lot of stuff left in it.  Linux Mint Cinnamon : Most like Windows : https://www.linuxmint.com/download.php   Check Videos out : Here.

It comes with Software and tons & tons available : https://alternativeto.net/platform/linux/

If you have Linux questions visit BC's Linux Forum on the 1st page of the Forum. Tutorials  and experts that know all about it.

 

 

If I go into safe mode all is good.

That means that some program or app is causing the system to crash (I'm sure you know this already   .  In Safe Mode, Windows loads only the most essential drivers to get up & running, while not loading various programs and apps. 

I don't think the power supply would be causing this. If it were faulty, even Safe Mode would no work. 

The only way to test your video card is to try it in another computer or swap it with another in yours; since you have a Pegatron MB I doubt that you have integrated video on the board, but if you do then just remove the card and the I.video should kick in. If the computer boots normally, the card is the problem. 

> Next step I suggest is doing a clean boot process. M/Soft included this diagnostic tool to try to help a user find the loader that is causing the problem. Essentially, what you do is disable all non-system loaders. Reboot Windows then re-enter the Clean Boot menu and enable each app 1X1 until suddenly the computer does not boot again. Then you know which app/program is causing the problem. 

> Another tool M/Soft included to try is using System Restore and choose a date immediately before this problem started. Hopefully you have made system restore points in the past, if not then this will not help. 

> Another diagnostic that you can try is SFC/Scannow. There is a lot of info on this on the internet.

> More info Here.  

I hope something here helps you. 

Edited by ranchhand_, 24 June 2025 - 08:01 AM.

Okay, here's the super short version:

Hey! That sounds like a classic driver or hardware stability issue.

Try these key steps:

• Run AVG's official remover tool in Safe Mode to ensure a clean uninstall.

• Test your GPU: Remove the Radeon 6870 and connect your monitor to the motherboard's onboard graphics. If it stabilizes, your GPU is likely faulty.

• Test your PSU: If possible, swap it with a known good one. Listen for unusual noises.

• Clean reinstall your GPU drivers using DDU in Safe Mode.

• Check Event Viewer for critical errors around the hang time.

Your system is old (Windows 7, 6870). If a component is failing, a full system upgrade (CPU, MB, RAM, GPU) is usually the best long-term solution, as a new GPU will be bottlenecked and may lack Win 7 support.

Good luck!