Vista - safety live one care help

about once a month or so I will run the free safety one care scanner and the other day while going through my uninstall program list I noticed that this program was installed on my computer. I never noticed this any other time I ran it. So I uninstalled it and ran the scanner again and checked and it wasnt there but ran it again and it was. I also stopped the scan half way through once and noticed that the sheild logo in the uninstall program list was just blank white sqaure and only about half of the size of the program was there and when I uninstall it I get a message saying it didnt uninstall correctly and gives me to options to choose from Something else I noticed that was funny was one time I highlighted it but didnt uninstall and came back and the program was no longer listed in the list. Could anyone tell me what might be going on here and if anyone else has had this happen?

We need far more details from you.
You say "This program........" What program?

Please list the security programs you are using [apart from the "free safety one care scanner" that you run once a month ] eg firewall, anti virus that may have been preinstalled on your computer, anti malware, defender etc.
Is protected mode on?
It would also help if you filled in your system specs.

Is this the 'Scanner' [Tool] that you are talking about? If so, we need to know which Browser you are using.....Windows Internet Explorer or Mozilla FireFox?

Windows Live OneCare safety scanner: Free online tool for PC health and safety

Or is it the Microsoft Windows Malicious Software Removal Tool , here
Download details: Windows Malicious Software Removal Tool x64

I make a bet, it's the first one. If so, it's the temporary installation until the scan is completed.