Hi, do you know some CMD commands to fix things? If you never used it before, I have to warn you! But if you love fixing things, I can give you some steps and the machine might respond well after that. First, these issues are caused by corrupted system files, which can be fixed with a command, or by having a full C: drive, which means you need to free up some disk space.

I have several computer books on Amazon, but for this issue, you don't need to read the whole book full of codes, do you? If your hard disk is not yet full, which you can check by navigating to "This PC" and see if the C: drive is nearly full or not, then please try to run a disk check as an Admin using the command below:

sfc /scannow

one thing i found is that my browser was leaking memory....
so the temp memory was filling to overflowing...
a little application called rammap soon put paid to that...
it's free and i run it several times a day...
i just look at the memory useage via resouce monitor and if the blue is too large then use rammap to get rid of it...click empty>>empty standby list
and your temp memory becomes free....
so it does all depend on why your computer is slowing down...but browsers and windows are some of the main culprits...and if you haven't then updating to a solid state drive is a big speed gain....