Thats a Problem with Avira Definition File from this evening. It detects the PSPadShell.dll as a Trojan. You have to wait until the next Avira-Update. Meanwhile select "Ignore" when Avira prompts its Error Message or disable Avira this evening.
-- <http://forum.pspad.com/read.php?2,46870,46873> PSPad freeware editor http://www.pspad.com
