problems loading Addictive Drums

Did you go into the online installer and double-check your path settings?  I'd either move the .dll to where XLN is expecting it (program filesx86\steinberg\vstplugins) or point the XLN installer to program files\cakewalk\vstplugins.
 
I ran into a similar issue when I couldn't play anything through AD...turns out that although I'd installed the samples on a dedicated drive, I hadn't designated that file path in the online installer. Once I did that everything was gravy.

The easiest route would be to open the XLN Audio Online Installer, go to the Advanced tab, then change the plugin path to C:\program files\cakewalk\vstplugins\ since that seems to be where the file actually is right now. Once you apply/save those settings and re-launch AD, everything should come up.
 
The other route would be to leave the online installer alone and manually move (or copy/paste) the file through Windows Explorer.  Go to C:\program files\cakewalk\vstplugins\ and find the Addictive Drums .dll file. Right-click on it, select "Copy", then navigate to C:\program files (x86)\steinberg\vstplugins and right-click "Paste".  Then you should be good to go.
 
(The only caveat is that the x86 folder is for 32-bit applications and I'm not sure if that makes a different if you're putting 64-bit plugins in there.  Someone else on here probably knows better than I do with that sort of thing.)

Typically if you're installing a 64-bit plugin or synth, it will default an installation path to the appropriate folder (C:Program Files for 64-bit, C:Program Files (x86) for 32-bit). I honestly wouldn't think it would matter where it ultimately gets installed because it's the application itself that determines whether it's 64-bit, not where it lives.
 
But as far as "changing" goes, you can't really change a 32-bit application into a 64-bit application.  Some plugins/synths offer both versions, so you just select which ones you want when you install them.
 
You can still run 32-bit plugins/virtual instruments in SONAR, though.
 
Regarding the specific virtual instruments you've mentioned, I'm not sure if all of them offer both 32-bit and 64-bit versions.  But if they do and you only have 32-bit versions installed, you can always re-run the installer and select the 64-bit version, then pay attention to the drive path of where it's installed and make sure you're looking there when you run a scan.  Do you use Plugin Layouts at all? I find it very handy to set up a custom layout and thereby only select 64-bit versions, VST3 versions, etc. 

I'm finally home from work so I can actually look at the XLN Online Installer. :)
 
When you open the Advanced tab, you've got three options:
- Addictive Drums 2 (the path where the actual samples are stored; mine is on a second drive)
- VST32 (path for me is C:\Program Files (x86)\Cakewalk\Vstplugins\)
- VST64 (path for me is C:\Program Files\Cakewalk\Vstplugins\)
 
Whatever your path reads for the VST64 version, make sure that location is among the folders listed in your SONAR Plugin Manager.  If not, add it, then do a re-scan and it should be available to put in a custom layout if you're using that, otherwise it'll show up in the default layout as well. Then use that version of AD whenever you're inserting the instrument in SONAR and everything should link up.
 
If you still run into issues or are accidentally using the 32-bit version, it wouldn't hurt to delete the 32-bit version entirely.
 
If you search Windows Explorer for "Addictive Drums 2.dll" and you get two results, you can delete whichever one isn't in the path specified for the 64-bit version.  Then if you do a re-scan in the Plugin Manager, SONAR will only find one option instead of two, and you'll bet set.
 
Good Luck!

I'm a little confused.  
I went to Preferences and tried to find the path for the 64-bit plugin, under Program Files.  
When I added it, the path read, C:\Program Files\XLN Audio Files\Addictive Drums 2\
 
Not sure what to do....
 
Greg

I went to the XLN Online Installer and went to Advanced Tab.   On the left is says...
Addictive Drums 2
VST32
VST64
 
The path that says it's in C:\Program Files\XLN Audio Files\Addictive Drums 2\  is in the Addictive Drums 2.
When I click on VST32, it says, C:\Program Files (x86)\Steinberg\VSTPlugins\
And when I click on the 64-bit, nothing is there.  But it does begin with G:\ - my second hard drive.
Under the VST64, it says, Choose New Path...and, Set To Default.
 
Sorry to be taking up so much of your time.   I know there's a simple answer here, I just don't know what it is.
Thanks!
Greg
 

I went to Start in Windows and typed in Addicted Drums 2, but there is no Addictive Drums 2.dill.  I can't find it.

I did, and it says, "No Items Match Your Search."
I typed in Addictive Drums 2 (without the .dill), and it shows an AD2 plugin log and standalone log.   No .dill file.
 
 

Sorry, been away from the computer this weekend.
 
Just to confirm, did you search for a ".dill" file or ".dll"?  ".dll" is what you're looking for.

Naw, easy to overlook if you aren't in the habit of digging around for such files, which you wouldn't have to do if things worked correctly from the get-go! 

I guess what I'd do in this situation is uninstall AD2 altogether, then start fresh with a new installation, paying attention to the drive paths in the Advanced tab during the new install.
 
Or just wait for XLN Audio to get back to you if you're patient enough! But it certainly seems like something's goofed up and they may end up recommending a fresh install anyway.  Keep us posted on how things work out!

It just sounds like you didn't install the 64-bit version at all. You said the Online Installer asked you to pick a "new location"? Did you? Then didn't the 64-bit plugin install there? Don't forget to add that to the folders that Sonar scans.

What if I just download the 64-bit version, since I have no idea how to uninstall the 32-bit version?