Combo - That's just what I've done as well.
When my older store bought rig, [which easily surpassed the minimum specs needed for DAWs,] wasn't really up to par for all the VSTs, etc. I built my own rig, complete with some of the best & fastest components available.
I've kept it off line and use my older one for the net, downloads, emails, photos, etc.
There is a small bit of inconvenience having to register & authorize programs, and Vsts and stuff, by transferring info using a USB flash drive, but I find it's well worth it.
You can also get updates for Windows and other things. Just search how to do it.
Personally, I never bother with Windows updates anymore though.
If my stuff's working, then it's working. Personally, I find Windows
updates to cause as many new problems as they claim to solve.