I am assuming your event viewer errors are mostly cured by now, if not please paste here (reboot first if you haven't). No old messages unless the error persists. Cheers...

Oh and please try tech support tomorrow, if there's an issue specifically to do with tech support I suggest a new thread just to do with that.

Checking that Win7 is "whole" is a simple check:
 
Start - type this in Search Box ->  CMD   find at top and RIGHT CLICK  -  RUN AS ADMIN

Enter this at the prompt - sfc /scannow

How to Repair Windows 7 System Files with System File Checker
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Yes why not, but do a chkdsk first I suggest (and best to back up first if you can). Heck do a defrag for fun afterwards.
I'm thinking it's possibly dodgy plugins now, let's see what the event viewer says after all this.

After/before doing a chkdsk, I would also suggest doing a memory test (http://www.memtest86.com/).
 
A couple of times I have traced really odd behavior back to a faulty module.

scan disk showed no violations, memtest showed all 32gb working properly, chkdsk showed no errors, 0% defragmented, no outlook running on startup or otherwise as far as I can tell...
 
 
Log Name:      Application
Source:        Application Hang
Date:          12/2/2013 6:41:56 AM
Event ID:      1002
Task Category: (101)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Jams-PC
Description:
The program SONARX3.exe version 20.0.3.223 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
 Process ID: 106c
 Start Time: 01ceef5b15d90726
 Termination Time: 30
 Application Path: C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe
 Report Id: 1b3474e2-5b4f-11e3-86ea-20aa4b6219d2
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Hang" />
    <EventID Qualifiers="0">1002</EventID>
    <Level>2</Level>
    <Task>101</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-12-02T12:41:56.000000000Z" />
    <EventRecordID>14003</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Jams-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data>SONARX3.exe</Data>
    <Data>20.0.3.223</Data>
    <Data>106c</Data>
    <Data>01ceef5b15d90726</Data>
    <Data>30</Data>
    <Data>C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe</Data>
    <Data>1b3474e2-5b4f-11e3-86ea-20aa4b6219d2</Data>
    <Binary>430072006F00730073002D0074006800720065006100640000000000</Binary>
  </EventData>
</Event>

This is like the "Energizer Bunny" issue. Did you run the system file checker in #83 above? That is a check that Windows can perform on itself to verify that the installed files are valid.
 
Doing a quick search on Event ID 1002 here as well.
 
Edit: Event ID 1002 (http://technet.microsoft.com/en-us/library/cc735604(v=ws.10).aspx) looks like it is mostly isolated to Windows Installer, and possibly a bad installation.
 
Did you reinstall X3 during your trouble shooting?

I did run the sys file checker with no violations reported. I have not done a reinstall of X3c yet. I will reintall now.

I uninstalled, can anyone tell me how to get it back? reinstall from where? Do I need to buy it again?

If you hold a legitimate license for the software, you would not need to repurchase - at most, you would need to download again, and that is only if you either no longer have the original files or if they were potentially corrupted.
 
If you had done the original download with antivirus software running, you may have ended up with corrupted files on the download.
 
If that was the case, then you will want to download the install files again, from your store account, and this time temporarily suspend any and all antivirus software.  After completing the downloads (multiple files), you can evaluate them for 'correctness' with the check sum info provided by Cakewalk.  (I also recommend downloading using a file manager, such as the one included in Chrome).
 
If you had/have install discs instead, you would install from those.
 
Can you please detail how you went about doing the uninstall?  I just want to make sure you have gotten all traces removed, such as hidden data and registry entries.
 
Thanks, 
 
Bob Bone