My Win7 laptop works fine for 15/20 mins then freezes. First I get 'Not responding' at the top of whatever program I am using, then if I click again the screen greys out. All I can do is hold down the on/off button to switch off, then start over again.
Well I ran Malwarebytes which found 5 PUPs to be removed but I couldn't run a virus scan as it freezes before completion.
Also, a monitoring program I have reports that approx 35% of RAM is being used and the processor is running at around 140F. Is this OK?
Just a thought - these symptoms are identical to problems I get occasionally on a particularly large spreadsheet in Excel. I find that it clears itself after about 5 minutes and I can carry on working. It only affects the one window and other open windows work fine.
How long do you leave the PC after the problem occurs?
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