that is all good advice but if you computer is running slowly and the problem is linked to the hard drive (which is very possible) that will not resolve your issue and you will just get it running slowly again after a while.
So that is why I mentioned low-level formatting. When you format a hard disk NONE of your data is lost what it actually does is erase the Table of contents so it does not know where to find your data.
I would suggest a complete fresh build which would include deleting any exsisting partitions and creating new ones and then low-level format it so it erases EVERYTHING of the disk.
But please do not attempt what I have said!!! lol I do it for a living and unless you do please do not try it lol
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