Windows 7 - How to prevent auto-popup of WinDefender at startup?

When I start my Windows 7 system then automatically "Windows Defender" pops up a window telling me with a yellow bar that the"Service has stopped".

After a while (approx 2-3 minutes) without doing anything else and clicking NO button the bar turn into green color indicating that there is "no unwanted or harmful software detected".

Questions:

How do I suppress the Win Defender at all?

How do I suppress it in case that is yellow or green but allow it when viruses are found?

How do I disable WinDefender (=not only the window appearance but the full software) completely ?

Peter

Use one of the best anti virus around; Microsoft Security Essentials. It will stop Defender, automatically. Its engine includes Defender plus a good anti virus.
All you need for protection is Microsoft Security Essentials, The Windows Firewall, which you just turn on, as you have it already. Then Download and scan once a week with malwarebytes. Your problems are over.

I second this opinion.

Third it.

Press Start.
write "windows defender"
Open it.
Go to Tools at the top,
go to Options,
Go to Administrator,
Untick Use this program.




Now,
Press start
Write "Services"
Find "Windows defender"
Right click it,
Go to Properties,
change startup type to "Manual" (if it's not changed already.