Funnily enough I have just started using a UCA 202* at work for recording "events"!
I am even running it on a Vista laptop by crikey!
First off the device will default as a usb "mcrophone" and only the left input will work and this will record a mono signal to both channels. The fix is to delve into the sond setup menus until you get a list of options. You want "Stereo, 16bit, 44.1kHz".
That ^ is for W7 and Blista, XP should be ok as is. If you have win8 you are on your own bub! Next you need to set sensible levels and that starts at the mixer.
I am betting it is a generic mixer of the Behringer/yammy/tascam et al stamp? Plug a mic in and set channel gain at min. Set channel level at "0" (not minimum!). Set Main Mix/Main out/ Rec out at "0" then waffle a bit and increase the gain pot until the meters jeeesust blink the -20LED. Plug the 222 RCA inputs into the mixers RCA rec' outs and fire up the recording software (?) The meters on the software (waffling the while) should also be hitting around -20(dBFS as it is called) ....Rock and roll!
Much of the above will be G'gook but do not despair. Just have a go and keep asking and bit by painful bit, grokking will be.
*Ooops! Forgot. AFAIK the 222 and the 202 are electronically identical?
Dave.