Hi Vlad,
I understand that your Windows 7 PC is crashing randomly after running normally for 1 to 3 hours, and you've already confirmed that the processor is not overheating.
To narrow this down further, could you provide:
- Does the computer show a Blue Screen (BSOD), restart by itself, freeze, or power off completely?
- Is the issue recent, or has it always occurred?
- Are there any error messages or stop codes displayed?
- Is Windows 7 running on a desktop or laptop?
Please note that Windows 7 has reached End of Support (EOS). While Microsoft no longer provides updates for Windows 7, you can still try the following workarounds:
1, Open an elevated Command Prompt and run: chkdsk C: /f /r
Restart the PC when prompted and allow the disk check to complete.
2, Check the Windows Event Viewer:
- Press Windows + R
- Type eventvwr.msc
- Review Windows Logs > System for Critical or Error events occurring at the time of the crash.
3, Test the memory:
- Press Windows + R
- Type mdsched.exe
- Select "Restart now and check for problems"
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