If you have a Windows operating system that you can work with, then keep it.
There are seldom any advantages in 'upgrading', you get nothing new, and may find major problems in other software / hardware that previously worked. Chances are it will probably take more disk space and memory, and could work slower than the O/S you have.
The constant patches and upgrades are to fix an increasing numbers of holes which hackers have taken advantage of. It is a patchwork of ever increasing layers IMHO.
As to fixing viruses and malware, who knows better than M/S how their layered crochet works, yet there is still no anti-virus built in. DOH !!!