Overheating can be caused by many different things. It could be defective hardware. I'm not going to try to address it more specifically, because hardware is not my area. But I will challenge you with this: What leads you to believe that the PC is overheating?
The problem you are describing with the mouse pointer could also have many different causes. There are settings that allow you to adjust the sensitivity of the pointer and the touchpad; you could check those. Or, once again, it could be internal hardware that is defective or wearing out. Have you tried using an external mouse?
"This copy of Windows is not genuine" means that Windows has failed the license validation on the Microsoft server. It is probably a pirated copy of Windows.
You didn't identify which version of Windows it is.
If it is in fact a pirated or cracked version of Windows, then the PC may also be infested with malware, spyware, or worse.
The problems you are describing are so serious that I'm not sure it's worth your time and energy trying to clean up or fix this machine.
I am not suggesting that you simply give up and throw it away.
You should probably just wipe it clean and install a new operating system.
You have a couple options available that will allow you to test the computer with a fresh OS, to see if it runs well, without spending any money at first.
Does the PC have a Microsoft label with a product key on the bottom? If so, what operating system is it for?
For most versions of Windows Vista and Windows 7, it is possible to download a clean, valid .iso image of the OS, and burn it to a DVD, at no cost. But you don't get a product key.
You can then install the operating system, but you can only use it for 30 days, and then you have to activate it with a valid product key.
In other words, you can install a new OS on the PC without actually buying it, just to see if it will run well. If it runs well, and does not appear to have serious hardware defects, then it might be worth paying for a license key for Windows 7 or Windows 8.
The only other suggestion I have would be to try booting the PC with a live Linux disk, and see how well it runs that way...
If you don't know what a live Linux disk is, you probably don't want to go there. Linux is really not that hard to use, but you don't want to try to learn how to use Linux for the first time on a seriously dysfunctional PC.
But if you're gonna do it, I recommend a lightweight distribution called Puppy Linux.
Linux is an open source OS that is available at no cost, in many different versions.
If the PC runs well on Linux, then that tells you that the hardware is in good condition, so it might be worth buying and installing a new Windows operating system.
Edited by TaxPro, 25 February 2013 - 01:28 AM.