Oh, absolutely. Especially the second one. I won't go into too much detail but the company I work for has a virtual desktop service. 4GB is the cheapest, and it shows performance wise. Still, 4GB at least works. We used to have something like 80GB as the C: drive, but we had to force most clients to ~120gb at the minimum, since just windows, office, and updates eat all that up, especially if cached mode got involved for email.

Going back to RAM, personally I would suggest a minimum of 8-16gb for Windows, and I personally use 64Gb. If you want to know why I'm not on Linux yet, mostly the switch would be a bit of an effort to do and I'm not ready to do it yet. I doubt I'll get another Windows version though.