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black screen when a USB stick/ HDD is connected

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Hi, my Windows 7 updated approximately a week ago (despite me selecting DO NOT install updates - it still sneakily installed an update when I was shutting the PC down, as it comes up in a tiny bubble when clicking the shut down icon "shut down and install updates". I'd already pressed shut down by this point, so it went ahead and installed)...

Ever since the update was installed the PC has been running a lot slower, and when I put a USB stick in or HDD the PC will lock up for approx. 1 minute, then it'll have the egg timer, then the screen goes black and I have to manually power the PC off. This then means I have to go through 30 minutes or so of startup repair before I can log on again.

My questions therefore are;
1) Does anybody know how to fix this so that USB storage devices don't cause the PC to go into meltdown? (I've tried all the USB ports and get the same result).
2) How can I uninstall the recent update?

thanks
 
by the way this filepath doesn't exist on windows 7 so I have been unable to uninstall the windows updates

Start< Control Panel< System and Security< Windows Update< click on View Installed updates

I only have "system" and there's nothing in there about windows updates
 
USB sticks/ HDDs work fine in safe mode but cause the PC to lock up n normal mode.
This would normally suggest that it was an issue with a third party driver.

Have you checked for a system restore point that is before the time and date that the issue first became apparent.

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