Might depend on how handy you are with a screwdriver - what’s the exact model number ?
(going by your description, it looks like a Pavillon Mini, which is upgradeable)
Do note that the entry-level system that RoonLabs recommends for running their system is a bit faster than yours. Depending on where you live, and how comfortable you are with computers, it might be worth it to look into something that’s 100% supported.
Crucial lists a 4GB stick that’ll get you to 8GB for $35, 16GB for $150, then, conservatively speaking and assuming you don’t want to go through the research to make sure you can use the M.2 slot for hard drives, add another $100 or so for a SATA SSD (you’ll want a bit of space to reinstall windows, so I’d say at least 128 gigs, and 256 might be better), you’re at $100-250 to upgrade what you have, vs $370 for Roon’s recommended base system, which’ll give you something with official support.
Depending on the motherboard, you may even be able to install RoonOS on it 