hello yesterday Ive found out I have a virus called : MST.exe
the main goal of this virus is creating file that you wont find easily and of course you will be lagging like hell when the virus is creating to file .
I had 453gb of those file ( fulled the rest of my hdd )
but you can easily get rid of it ( other than anti-virus cause mine never found it)
so first step is to know if you have it , if you have really low space on your hdd and each time you make space it get full after less than 1 hours you probably have mst.exe
second step is to download HDgraph on their official website. it will allow you to see what file take how much space on your drive.
If you see a file call mst or an enormous file that you dont know what is it you can click right to go into the file .
third step , you can easily see if its mst.exe when you are into the file, you will see a TON of file with date instead of name you can simply delete all the file in it , there is a uninstall program but I dont know if it work since you cant see mst.exe in the uninstall program page.
hope this help!