The CPU going to 100% in Win 7 updates is a known issue but can be fixed.
https://blog.krissmilne.tech/windows...ng-for-updates
Linux Mint is a good replacement for Windows, if you just want to use internet (Firefox) and Office (LibreOffice) stuff. There are a few things that don't work, although I've successfully got Netflix to work on it (needs out of date 32 bit version of Chrome. Fine on older kit too, just don't expect Netflix etc to play in HD....