Cannot upgrade iTunes

Question

After receiving a new iTunes dl file I tried upgrading and got the following error: The older version of iTunes cannot be removed..." I went online and found a "solution" to the problem but it did not help.
Here is what I did:
Try this and see if this might work for you. Also if you are using this itunes through a School or Corp/company connection that could be causing the error involving Network Connection.
1. open Local Disk C: in My Computer or whichever disk programs are installed on.
2. Open the Program Files folder.
3. Right-click the iTunes folder and select Delete and choose Yes when asked to confirm the deletion.
4. Right click the iPod folder and select Delete and choose Yes when asked to confirm the deletion.
5. Right-click the QuickTime folder and select Delete and choose Yes when asked to confirm the deletion.
6. Delete the QuickTime and QuicktimeVR files located in the C:\Windows\system32\ folder.
7. Right-click on the Recycle Bin and on the shortcut menu, click Empty Recycle Bin.
8. Restart your computer.
9. Go into Add/remove programs and run a repair on itunes, this will rebuild the folders that you just deleted from the program files.
If this does not work for you please post any errors that you receive
I did all this but I still cannot uninstall, change, or repair. "The error msg is: The installation source for this product is not available..."
Now I am without iTunes amd canno sync my iPod or do anything else with MS Outlook.
Help? Thanks, Tom

Answer 1

The older version of iTunes cannot be removed..."
I still cannot uninstall, change, or repair. "The error msg is: The installation source for this product is not available..."
Not the most common errors messages to get with this sort of thing. But it looks to most likely be trouble with your existing iTunes installation configuration information.
Unfortunately, this sort of trouble has gotten more complicated to deal with ever since Microsoft pulled the Windows Installer CleanUp utility from their Download Center on June 25. First we have to find a copy of the utility.
Let's try Googling. (Best not to use Bing, I think.) Look for a working download site for at least version 3.0 of the Windows Installer CleanUp utility. After downloading the utility installer file (msicuu2.exe), scan the file for malware, just in case. (I use the free version of Malwarebytes AntiMalware to do single-file scans for that.)
If the file is clean, to install the utility, doubleclick the msicuu2.exe file you've downloaded.
Now run the utility ("Start > All Programs > Windows Install Clean Up"). In the list of programs that appears in CleanUp, select any iTunes entries and click "Remove".
Quit out of CleanUp, restart the PC and try installing iTunes again. Does the install go through properly now?
(If you do find a clean download site for the correct version of CleanUp, please don't tell me where it is. Without wishing to sound paranoid (although I grant it does sound paranoid), there is a non-zero chance that posting links to download locations for the utility here at Discussions leads to that download location being shut down.)