Please try running it in Safe Mode and tell me if it is any better.
Start tapping the F8 key as soon as you switch on, a menu should appear, use the arrow keys on your keyboard to highlight Safe Mode with Networking, hit the Enter key. It should then go to the desktop, all the icons will be a lot bigger than usual. Run it for a while and see how it performs.
Please tell me if you have access to another PC (and the OS) and if you have, or can borrow, a Flash drive.
Start tapping the F8 key as soon as you switch on, a menu should appear, use the arrow keys on your keyboard to highlight Safe Mode with Networking, hit the Enter key. It should then go to the desktop, all the icons will be a lot bigger than usual. Run it for a while and see how it performs.
Please tell me if you have access to another PC (and the OS) and if you have, or can borrow, a Flash drive.