I an unable to update Microsoft Security Essentials, getting "Error code: 0xc80003f3".
I an unable to update Microsoft Security Essentials. I am running Windows 7 Ultimate 64-bit. When I expand the error popup box by clicking the "Support information" arrow it shows "Error code: 0xc80003f3". I researched this and the only thing I can find is that it is a memory error but my system has 3GB RAM and an ample pagefile (manually set and doubled the Windows "reccomended size") I am running a sidebar gadget that shows 44% RAM used so I'm not sure what is happening. The Windows update will not update either and shows the same error (8xc80003f3)in the event logs for the WindowsUpdateClient.
Original title: Error code: 0xc80003f3
Create a batch file with the following and run it from a command prompt.
*******Start File Below********
regsvr32 MSXML3.dll /s
net stop wuauserv
cd /d %windir%\SoftwareDistribution
rd /s /q DataStore
net start wuauserv
******End File Above*******
Go to services and stop the Windows Update service
Go to the Windows directory (default is c:\Windows) and rename the "SoftwareDistribution" folder to "SoftwareDistribution.old"
Go to services and start the Windows Update service
Worked for me.