Cannot launch Windows Defender

I can't open and run Windows Defender. Whenever I try, I get an error message. I was going to include a screenshot of the message I get, but I can't seem to paste here. Basically the error says that WD is currently disabled (and therefore is basically useless for the moment). He also recommended that I turn it on. I tried to turn it on, nothing works. Can someone who is tech savvy please help me get this on, for good?

I am running Windows Vista Home Premium, 32-Bit with SP2.

Thanks for any help.

PS - If you can tell me how, I'll include a screenshot of the error message, as well.

Thanks again!

If you have the following AV, antivirus, programs installed, close your Windows Defender. Purpose of these AVs have their own advocates. 2 defenders on the same machine will create conflicts. In this case, you do not have a problem.
List of AVs which will stop Windows Defender:
Norton
McAfee
AVG
Microsoft Security Essentials

If you don't have AV programs above, here's how to restart Windows Defender:

Start button > in the search box, typeServices > press the Enter key > scroll to find Windows Defender, click on it >...
topic status , it must be said... Has begun
under Startup Type, it must be said... Automatic
If it does not say that, right click on Windows Defender > click Properties >
in Startup Type, click on the pointer to the right and select automatic
to the service status, click Start
Click OK when finished.

Tags: Windows

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