You can also try installing one of the programs as Administrator to start with.
Right click on the install.exe file and select run as administrator. This is important.
Do not reinstall the program in the default directory.
After the uninstall, delete the original installation folder it the uninstall process didn't do it..
Create a folder and when asked tell the program to install in the new folder, (it doesn't have to be in the Program Files Folder, it can be anywhere), you don't want to pick up anything from the old install.
Windows isn't that smart, if it's in a different place it sees it as a different program.
If you use CCleaner run the registry cleaner after the uninstall, just to be sure you got rid of the old junk, I usually find stuff left over.
If you are installing from install files that are on your computer you can ever change the name of the install.exe file to something like altinstall.exe.
Can you tell us what one of the programs is, so we can check it out?
Contrary to other people here I always have the UAC turned off, it's the first thing I do. LOL
I've only found that it makes things easier.
I see I'm repeating myself here but you didn't say you have tried this.
You aren't alone, I did find a number of people with similar problems. https://www.google.com/webhp?source...2I&fp=62e584a64b780a28&ion=1&biw=1536&bih=755