Ample guitar crashing constantly

I have the Ample Guitar series and have not had any issues so far. Couple of questions come to my mind is Which Ample Guitar are you using and have you tried it in stand alone mode to see if you have issues with it by itself?
 
Kind regards,
Rick

Thank you for your fast responses.
I understand that it is hard to debug this type of problems so let me know if you need more info.
I used to have a Mac with an external interface, never had any problems now I had  move to Windows and I don't have any dedicated sound card.
My motherboard is an ASUS p8 Z77-V it has the default Realteck HD Audio. 
I am using SONAR Professional, and Ample Guitar M ( martin model) 1.8
I just contacted Ample guitar so they can send me the latest drivers , I guess they are 2.XX now
 
My profession is CG artist but I am also a musician, and I like to write some music for the videos that I do.  If the sound chip I have is not enough (I am guessing may be the problem) which sound card or external device you guys would recommend that won't break the bank :) but not el cheapo either.
 
I thought in buy some interface since I have a few acoustics and electric guitars, I also have a Alesis QX25  and Q49 MIDI keys.
Thanks again.
 
P.S.
Forgot to mention, that when using Ample Guitar M Stand alone there is no problems.
 

The Realtek chip can be adequate for playback, but tends to fall short for recording. A couple things you can try with this setup:

1. Go into Windows "Change Sound Card Settings," click on the "Realtek High Definition Audio" and then "Properties." On the "Advanced" tab be sure it is set to what your SONAR project is (mine is set to 24 bit, 44100Hz) and that both "Exclusive Mode" options are unchecked. Edit: Also disable everything on the "Enhancement" and "DTS" tabs.
2. Repeat this on the "Recording Tab" at the top. (Step 1 was for the Playback tab).
3. Inside SONAR Preferences (shortcut "P" or Edit->Preferences), check Audio->Playback and Recording on the left, and change "Driver Mode" at the top to WDM/KS or even MME. You will need to check the Devices and Driver Settings (on left) to be sure they are correct after shifting driver modes.
4. On the Driver Settings, you may need to bump up "Buffer Size" (in the middle) to 256 or so, depending on performance. Also ensure that "Audio Driver Bit Depth" and "Sampling Rate" match what you chose when adjusting the Windows settings in Step 1 above.

Unfortunately, that chip is not ideal, and precludes "ASIO mode" since Windows uses it. The above may give you adequate performance to do what you are attempting, but a dedicated interface with ASIO drivers is preferred. I have had very good experience with Focusrite products, and (depending on what you "need") the Scarlett 2i2 (2-in, 2-out)is a nice entry-level USB interface that is pretty much 150USD everywhere. There are others in this price range that are popular as well. http://www.sweetwater.com/c695--USB_Audio_Interfaces is a good place to read reviews for USB interfaces in your price range.
 
Edit: As you narrow down what options you like, feel free to post a question in the hardware section on opinions before buying. Also, it is good to buy from a store with a 30-day return policy just in case you are not satisfied with it.

You mentioned having an external interface for the Mac. If you still have it, are Windows drivers available for it?

I think you'll find many here have Focusrite interfaces, including the lower cost USB Scarlett series (myself included).   Works great with SONAR!