Try a virus scan. See if you picked up one. Then if that is not the case back your data for a reformat and a full reinstall of the OS. Only do that when you know you have all your important data backed up. This includes all email and all licenses. Don't forget the Windows key.   
 
Lets us know how you come out. I hope its a simple problem and you don't have to do the OS reinstall. That should be your last resort. Good luck!

Oh God! It sounds a bit beyond me!
Thankyou.  I'll do my best and let you know.  Might take awhile.  I'm not very tech savvy.
 
oh!.... Windows key??

MidiMoron
...I previously couldn't check for a hiding dialogue box because the minimize button is also unresponsive...

 
Minimize won't work on the main window until the dialog box is cleared (assuming that the dialog box is part of Sonar). To access the hidden dialog box, either right-click on the Sonar Taskbar icon or launch Task Manager.

On the other hand, some of your description seems to suggest that your problem stems from something else other than a hidden dialog box. Still worth checking though.

MidiMoron
Oh God! It sounds a bit beyond me!
Thankyou.  I'll do my best and let you know.  Might take awhile.  I'm not very tech savvy.
 
oh!.... Windows key??

Try what Kev is suggesting before you do anything else.

I went to try the "right-click" option you mentioned Kev, but didn't get the opportunity.  As soon as I hit export the program froze and all the error messages came up again. Then the program got shut down.  My preious method after the program froze, before I started getting error messages, was to use Task Manager to shut it down.  That was effective, but gave me clue to the problem.
 
I have done a virus scan and didn't come up with anything.  I am being told that my Firewall is turned off but it wont let me turn it on.  I also cant seem to disconnect from the internet!  I have a lot of learning to do.

MidiMoron
Oh God! It sounds a bit beyond me!
Thankyou.  I'll do my best and let you know.  Might take awhile.  I'm not very tech savvy.
 

If you are able, then you might need to get a qualified IT person to assist with you with this. 

From what I am reading in this thread, it appears that either your Windows installation itself is borked or you may even have a hardware issue.  I think the ntdll.dll file is related the the nVidia drivers...  so maybe updating these might be the answer  - Of course, the version you will be able to upgrade to depends on the age of your graphics card. 

It could even be your video card on its way out.  You might, also, want to check your system event viewer for a chronological list of issues.

Again, You might want to get a qualified IT person to assist with you with this whole process.

Thankyou promidi. 
 
I will look into those things as best I can, and possibly get some IT help after that.
 
What a pain!

I use X1.  Virtual Instruments (VSTs) can make it all crazy.  If you are only using True Piano, then I don't know.

Still trying to work out whether this is a specific project issue or not? Issues with new projects? If it isnt def run windows update, run chkdsk /R (google for details) then reinstall.Thx.

It wouldn't hurt to try the new sonar demo.