I have an Acer 5100 laptop that was given to me.  It originally had Vista, I upgraded it to Windows 7, then I upgraded it to Windows 10 recently.  It had originally been 32-bit Vista, then 32-bit W7, then 32-bit W10, but after I initially upgraded to W10, I created a 64-bit USB to do a clean install of Windows 10 64-bit because the specs said the computer was 64-bit capable.  The 64-bit installation was fine. 
 
Sonar X2a downloaded and installed fine, my interface's drivers installed fine.  Guitar Rig 5 installed fine.  Problem is, when I open GR5, it now says the CPU is overloaded, NO MATTER which amp model I'm using.  Even a standard model with no reverb or delay or any other effects, same thing.  Doesn't matter if it's in Sonar as a VST or standalone.  Same thing. 
 
The strange thing, though, is that it worked perfectly fine when I had Windows 7.  I checked my startup programs, only the ones I need for the computer to run.  4 gigs of ram, should be enough.... not doing any crazy mixing.  What the hell happened?

Oh, and, yes, I have tried uninstalling and reinstalling GR5.  This was happening even before I upgraded from Windows 10 32-bit to 64-bit using the USB stick. 

As a point of information for you, I use GR5 day in and day out. I'm on Windows 10 x64 and the latest Sonar Platinum and GR5 runs very well. What  you're seeing isn't universal. Have you tried reinstalling X2a and (strangely enough) your MAudio interface drivers? I've had a boatload of issues get resolved by reinstalling drivers.

Yeah, that's the funny thing -- I have reinstalled EVERYTHING.  I don't get it.  And, it's not Windows 10.  I'm running that on two other computers, both with Sonar and it's amazing.  It's something else.  I just don't know what the hell it is....

Is there's a way to setup Sonar 8.5 producer to get the CPU monitor not to be so high? I'm experiencing some program freeze (Never happended before).
Thanks,
 
Manny

4GB is really on the light side these days, but that doesn't explain why it is overloading. But check these things:
 
Is it on high quality? there is the little button on the side of the output meter.
Is the onboard sound card disabled?
Is wifi and network disabled?
How many, if any, unknown devices are on your laptop in device manager? W10 puts what it *thinks* works if there are no native drivers.
What is you sample rate in GR5? And on your interface?
Is GR5 to the newest patch level and authorized?