Answer Best answer as chosen by user francoisdupie
There's more hardware inside a PC than just memory and a hard drive. Replacing memory without first testing it (memtest86.com) doesn't make much sense. Replacing the hard disk for issues like this makes no sense at all.
If it still happens after a clean install of the OS, as you write, I'd suspect the other hardware . That's the CPU
(including the cooling!), the PSU (might be insufficient), the motherboard and the fans. You don't tell about your yearly cleaning and the use of a cooling pad if you use laptop on your lap in stead of a desk. Heat is definitely detrimental for a laptop. After 3 years, it might be time for a new one.
Your posting on software forums (Windows 7) seems to imply you think it's a software issue, however. Why do you think so?
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