Question Reinstalling windows 7

Jan 21, 2019
Hi, I recently built a computer and it has been slow lately so I plan on reinstalling windows 7. I did a check to make sure it was not a corrupt drive which it isn’t. So I tried to download a windows 7 iso but since I have slow internet it would take 12 hours to download, so I looked on my laptop for a windows 7 iso image and found one but when I tested it on a virtual machine it said it was windows 7 generation 2 and on the first boot it started as if it were a windows 10 machine. Could someone please tell me if this is an ok thing to install on my machine and if it is just windows 10 with windows 7 theme or if it will slow my machine down thank you