It's probably not your hardware at all causing these problems. Did your system function properly when it was new? If so, that tells you the hardware is probably OK.
The problem is most likely malware, or an overloaded or misconfigured system. Scan for malware first. This is best done by taking out the hard drive and checking it on a known good system with proper virus/malware protection.
Also run maintenance on the drive - scandisk, defrag, etc. Then put the drive back into the original system, and properly uninstall anything you don't absolutely need. Also check Startup Manager to stop any unneeded auto-loading programs. Most importantly, make sure you use ONLY ONE antivirus program, because they can conflict, and drag your system down severely.
You should probably remove ALL antivirus programs, reboot, then install only ONE. Finally, perform all system updates. And be sure to reboot at least once a day.
If unsure what to do, bring it to a pro. Good luck!
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