You might also try uninstalling SoundForge and re-installing it as Administrator. You might have to manually remove SoundForge's related registry keys.
 
Sony says all of its products must be run as Administrator. Log in as Administrator. Right-click on the SF shortcut, go to Properties -> Compatibility and check the "Run As Administrator" checkbox, and click the button labeled "Change settings for all users".
 
As a last resort, you might try disabling UAC. (Control panel -> User Accounts -> Change User Account Control, set the slider to Never.) 

I have had no problems with SF10 running it in W7 and before (W98, W2000 and XP). But in W10 running as admin must be selected.
I did not check platinum, but in X2 there is no tools menu.

Turn around just now....It's working at the moment, which is the first it's ever worked since I've been on this PC.  There were a lot of ideas above and I try to do things incrementally (so I know what would have done the trick), I don't know if I've got it pinpointed.  One thing that I had not tried before was bitflipper's suggestion with "Change settings for all users".  To be honest, I never paid any attention to that before.  But I turned Admin off FOR BOTH Sounds Forge and Sonar Plat.  The first thing I noticed is that I could drag a waveform into Sound Forge.  I wasn't able to do that before.  But I still couldn't load one into SF directly.  But then I loaded a different file into Sonar and I was able to load an audio file into SF.  I purposely updated it and it loaded back into Sonar fine!
 
As I said above, SF seems to not work when it's not opened as an Admin, so I don't know if this will crash and burn the next time I turn on the PC.  But maybe the "Change settings for all users" fixed that...Fingers crossed!
 
But in any event, thanks so much, everyone!  It's nice to be part of a strong and supportive user community!

A little more info - As I suspected, I almost immediately started having problems running SF as a non-Administrator.  I was able to get Sound Forge to run without being an Administrator by following the directions here -
https://www.custcenter.com/app/answers/detail/a_id/5176/~/launching-sound-forge-on-windows-8,-8.1,-or-10-results-in-a-registration-of
 
It seems running Sonar as an Admin or not doesn't make a difference; it's that SF can't be run as an Administrator.  WHEW!!!  Thanks again everyone!

Also to me this was very helpful. With the link above I could update the register which led to a normally working Sound Forge. After doing that I looked in the utilities menu, but no Sound Forge menu item.
I went up in this thread and followed the link mentioned. Followed the steps there and noticed that Sound Forge was already listed. After re-reading the text to do the modifications I noticed that the ampersand (&) was missing in the string value of the MenuText key.
Then restarted Sonar Platinum but Sound Forge still did not show up in the Utilities menu.
Then I searched the registry for Tools Menu and checked them all for the ampersand. There was one Tools Menu missing the Sound Forge key and string values. So I inserted them according to the instructions et voilà there it was.
A bit confusing is that the menu in the program is called Utilities and in the registry you have to look for Tools Menu. This may differ for complete new installations.
 
So another happy guy.

Two for the price of one!  Awesome, Jan!

scook
The type must be WaveEditor for SONAR to send the clip name and REGION arguments to Soundforge. The instructions are still accurate. I wrote a utility to help get the entries correct called SONARToolsEditor. It can be found here
 
I am finishing up a utility run tools as administrator such as SoundForge without setting SONAR up to run as administrator. Currently SONAR must be run as administrator to run SoundForge.

 
Been having this issue ever since I got my Sonar Platinum. Read your post and VOILA, problem of almost 2 years solved! you're a LIFE SAVER!!!!
 

A number of years ago there was a change from Tools menu to Utilities menu.

Simply get scook’s utility referenced in post #2. It’s by far the most reliable method to get all the various text lines accurate.