which drivers did you install for your interface?  you may need to update for 64-bit capability. 

here's the link in case you need it.  according to the specs you listed, you'll need the second download from the top:

http://www.rolandus.com/products/productdetails.php?ProductId=970

Good, that's a starting place. Do you have any stand-alone soft synths you can use? If so, try running one and setting it up to use your audio interface. See if you can get sound from it without Sonar.

The thing to do is divide the problem "it doesn't work!" up into parts. If you know the audio interface works, you can concentrate on everything upstream of it -- you know you won't have to test the speakers, cables, etc. Then you divide what's left of the problem up, and see whether it's before or after (whatever easily tested dividing point you choose).

I actually am now getting sounds from my software. I temporarily switched my audio format to MME, I still can't get sounds out of ASIO which is a problem... does anyone have any advice on getting my interface to work with ASIO? 

Provide some more information on what you have enabled in Options/ Audio/drivers. You really have to study this program, there's a lot variables.

I have disabled all the realtek sound hardware that came with my computer, and I have made the interface the default device for Audio input and audio output, so when I use Reaper I have no problems at all. But when I use Sonar my wave profiler says that my UA-25EX doesn't support the current audio format when i am in ASIO, WASAPI, and WAV, but when i am in MME it says that all of my in/out channels are OK. On the back of my interface there are a series of switches is there a specific mode that I should be in?? should I assume it is the programming in Sonar because I get sounds fine out of Reaper?? apart from this I am experiencing latency in my audio tracks when I am recording does this have anything to do with running my audio hardware in MME???