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Because right now it's in Bulgarian.

Yeah I got a trojan :S.

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If you are having issues removing an infection may I recommend reading What to do if my computer is infected by a virus or a malware? – DMA57361 Jan 21 '11 at 9:05
up vote 2 down vote accepted

You must to uninstall/reinstall Security Essentials to switch languages.

The English version can be downloaded from the official website or Microsoft Download Center.

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Another way is to hack the registry and reboot, which is much more convenient. Of course caveats apply: it might not work for your OS/MSE version. (I'm running Japanese Vista Ultimate, BTW.)

Changing "HKLM\SOFTWARE\Microsoft\Microsoft Security Client\Market" from JA-jp to EN-nz worked fine after a reboot.

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This worked fine for me too. Just closing msseces.exe and restarting it works too. – AKX Oct 24 '13 at 21:38

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