can't open extension manager

Extension manager crashes on start up every time, whether I access it by double clicking on an mxp file or by double clicking on the manager icon itself. I have dreamweaver mx and mx2004 installed (not at ease enough with 2004 to delete mx just yet). It was working yesterdya, but "unexpectedlky quits" on start up every time now. I've rebooted, deleted the prefs and com.macromedia.extensionmanager.plist file and it still quits!

I deleted my version of extension manager, and downloaded version1.6.062 from macromedia's web site, but it made no difference.

Please can someone help - I have an extension I need to install urgently!

OS10.2.8/dual 867/1.5gb ram/240gb hd.