Thanks Marcus. I've already turned off all of that junk, and this computer has never been connected to the net. I will double check though in case I've missed anything.
 
You guys have been a great help.
 
 
Regards,
 
Bob

With that additional 4GB of RAM you should be just fine.   I'm running X3 on a Q9300 2.5 GHz with 8GB RAM, under Win7 x64, and SONAR runs well with multiple softsynths, FX, audio tracks, etc.   So with an i3 I'd imagine you'd be at or just above the performance I'm getting. 
 
Just be prepared for the UI and workflow changes, because that's where you're likely to see the most difference when compared to 8.5.  Just give it some time and use any and all learning materials available.  It's certainly different, but for many (most?) of us it surpasses the "classic" editions by a long shot in most areas.
 

Just to explain my initial comment; most modern DAWs in a pro studio are more near the top end of the spectrum. At least 8GB of RAM and usually 16+, running i7 quad cores or higher. So, your system is modest compared to serious modern DAW PCs. But then, you may not often need 150 audio tracks or 200 simultaneous plugs. Your Sonar 8.5 performance is probably the best thing to judge how X3 will do. It shouldn't be much different in itself, as it depends more on the plugins and instruments you use.

  Just d/L'd last night, and started playing around with X3 this morning. WOW! This thing is incredible. True, the UI is quite different and will take some time, but at first glance, I'm loving X3. 
 
  I always had latency problems with 8.5.3 and my Saffire USB, but it's performing flawlessly now. I know this computer isn't pro quality, but I rarely use more than 8-10 tracks. Just doing song demos, nothing for release.
 
  I really appreciate all the help. 
 
 
Regards,
 
Bob