Random power offs, bluescreens and low performance

First place to look is a corrupted driver.

This is a simple first line to try for minor driver problems.

Open Device Manager. Display adaptors is a good place to start. Click on it and it will open to your video card. Right click and select "uninstall device". When the next windows opens do not check the "Delete the driver software for this device." Just select "Uninstall" box.

Your screen will look wierd for a short while but when it settle down go to top of Device Manager, click on "Action" and select "Scan for hardware changes." This will do a quick reintstall.

Reboot and see if this fixes the problem. If not go through some other devices such as Network adapter, etc.

But with errors like the "nvlddmkm.sys" I would try completely uninstalling the display adapter drivers. Nvidia in your case?

The best app for this is the freeware program DDU

(Display Driver Uninstaller).

It completely clears out everything to do with your GPU/Display Driver/Video Card Driver - whatever you want to call it.

Read their directions first - don't rush it!

I have fixed many strange problems with this in the past. Corrupted drivers will mess up memory access, settings, etc., etc.