Please I need a help: Sonar X3 Studio does not permit to add a VST Patch and Scan VST Plug

I must confess I do not understand all that you are saying. I get the idea that you are unable to load VSTs at all now. Is that true?  I would try to install Sonar X3 once again. I would not delete anything. Just install it. After that install all the patches to X3 to bring it up to X3 e. You may need only install the e patch. 
 
Once installed and up to date with the e patch, check the path set up for your VSTs. This is done in preferences. You should see the path where you have your VSTs. It is on my system Programs Files/Cakewalk/VSTplugins. This is for 64 bit plugins. If you have 32 bit plugins they should be under Programs Files X86/Cakewalk/VSTplugins.
 
 

I don't understand what is meant with "VST patch", it's not a term we generally use in a DAW environment. There is a VST plugin, a VSTi (instrument), a VST folder... What do you mean by "patch"?
Also, it's not necessary to uninstall oter Sonar versions when installing a new one, in fact this can lead to similar trouble like you're having. Sonar versions share some information between them but they run fine next to each other. Have you tried leaving normal X3 and then installing Studio on top?

Ahhh VST path! Thanks!
Ok, have you tried running Sonar as Administrator? (Right click and choose "run as Administrator")
Does that help?

So you are able to use some plugins? Which ones? So far I was under the impression that you can't use VST plugins at all?

Ok, and Sonar won't access its own plugins unless you run as Administrator? That is very strange.
I don't want to sound annoying, but you mean "path" not "patch". A path is literally a road to somewhere, in this case it leads to the location of the VST plugins. A patch is something you use to repair a hole, or in synth terms it can be a "preset sound" (derived from using cables to "patch" together a sound on a modular synthesizer). In DAW terms it is often used as an "update", a piece of software that "patches up" problems in an older version. It gets pretty confusing when mixing them up :)

I'm sorry you're not getting this to work and I'm pretty confused as to why. You could try deleting the aud.ini file, that stores some important settings related to Sonar's global preferences I think. Perhaps it got corrupted or is protected or something. Moving it to your desktop might be better than outright deleting it, that way you could put it back if necessary. Sonar should create a new one by itself though.

Oy!  Patch é a palavra errada, utilize a palavra caminho, em vez :)
 
(The above is Portugese for "Patch is the wrong word, use the word path instead").  I used Google Translate for this, in case anyone needs to do that in the future.
 
I played some basketball in Brazil, and only learned enough Portugese to talk to the ladies.  :)
 
You keep using the word 'patch' - but the correct word there is 'PATH'.
 
You reported you cannot set the path for Sonar to find your plugins.
 
OK - Sonar works great in either 32-bit or 64-bit, so there is no need at all for you to install a 64-bit Sonar, unless you want to.  I am just saying that you do not have to do that.
 
Try the following:
 
1.  Start Sonar
2.  Do not load a project - just hit 'ESC' to close the Quick Start dialog box.
3.  Click on Utilities, and then click on Cakewalk Plug-in Manager
4.  There is a section near the bottom, called VST Configuration, and right under there is a button labelled 'Options' - click this.  This will open the Cakewalk VST Scan Paths dialog box.
5.  There will be a list of paths displayed there, and some options at the bottom.  As I understand it, the path to YOUR plugins is not listed there.  IF that is correct, click the 'Add' button, to add the path to your plugins so that Sonar will be able to find them.  This will open a dialog box for you to browse to the folder where your plugins are located.  Navigate to your plugin folder, and click on it.  That will highlight your folder path.  
6.  Now click OK, and the Cakewalk Plug-in Manager will add your plugin folder path to the list of paths it will search for plugins.  Once you click OK, this dialog box will close, and you will be back at the main screen for the Cakewalk Plug-in Manager.
7.  Now, click on the button labelled 'Scan VST Plugins', and the Cakewalk Plug-in Manager will scan for new plugins, and will include the new path you just added that points to your plugins.
8.  Once that scan finishes, you should be able to see your plugins, by clicking on the left side, on the button for the TYPE of plugin you want to verify is there - such as VST Audio Effects or VST Instruments.
9.  Click 'Close' to exit the Cakewalk Plug-in Manager, and return to the main Sonar X3 screen.
 
Please try the above and post back with your results.
 
Bob Bone