Antivirus keeps shutting down

hi there before we get to the complicated stuff have you tried un-installing and re-installing the security software? and its always best to not have more than one security software installed.

have you checked in the services that windows defender is set to automatic ? (mine is disabled because i don't use it)

MSE includes Windows Defender, so you can disable that in "services".

have a read of this if you have time >> Windows Defender and Microsoft Security Essentials - Microsoft Answers

Windows Defender and Microsoft Security Essentials

Applies To: Microsoft Security Essentials | Getting Started and Upgrading

Q: How is this different from Windows Defender?
A: Windows Defender detects and removes known spyware only. It is not designed to protect against the full breadth of malicious software, and specifically does not prevent viruses, worms, Trojans, and other malicious software from infecting your machine. The new no-cost solution will be a comprehensive anti-malware solution.

Q: Is Microsoft Security Essentials designed to replace Windows Defender?
A: No but if you are running Microsoft Security Essentials, you do not need to run Windows Defender. Microsoft Security Essentials is designed to disable Windows Defender in order to manage the PC’s real-time protection, including anti-virus, rootkits, Trojans and spyware.

Q: Does installing Microsoft Security Essentials disable Windows Defender
A: Microsoft Security Essentials should disable Windows Defender on Vista and Windows 7 and uninstall it from XP. In some cases, this does not happen automatically.
Q: Do I need to manually disable or uninstall Windows Defender if I am using Microsoft Security Essentials?
A: If Microsoft Security Essentials did not automatically disable Windows Defender on Vista or Windows 7, you should disable it to prevent conflicts. Windows Defender cannot be uninstalled from Vista or Windows 7.
If Microsoft Security Essentials did not automatically uninstall Windows Defender on XP, you should manually uninstall Windows Defender via Control Panel/Add or Remove Programs.

Q: What happens if I do not disable or uninstall Windows Defender if I am using Microsoft Security Essentials?
A: If Microsoft Security Essentials and Windows Defender are both running, your system may experience performance degradation and other problems caused by the conflict of two services providing real time protection simultaneously.

Jacee said:

MSE includes Windows Defender, so you can disable that in "services".

good call :) good advice

calccrypto said:

so the conflict somehow resulted in my computer thinking that MSE hasnt scanned for a long time?

it appears that way