It's the 660s http://www.dell.com/...nspiron-660s/pd and it says 220W So there are no cards that work with the existing PSU? I don't want to upgrade anything, just want a video card even if it's basic.
Kee-ripes; I've not only never BUILT a PC with a PSU that weak, I've never seen an OEM PC with a PSU that weak since the days of the Pentium (pre numerics).
And by never, I mean exactly that - even back in my Pentium days, I used a 300W PSU; yes, they existed then, and weren't pricey in the least.
OEM PCs that passed through me at some point (and that includes quite a few Dell and HP OEM models) typically had 250W PSUs, while some (mostly Pavilion Media Center or the odd Optiplex) had the 300W PSUs.
Is this a slimline (Inspiron) case design? Then you may need a PSU designed for such cases, such as PC Power and Cooling's Silencer Slimline (no longer made). If the case can swallow a standard PSU, I'd go with something similar (Silencer Mk. III 500W or equivalent from Corsair, Antec, or other quality manufacturer).