Well, if you have cleaned out the registry then, not too sure what else to suggest. I guess you could uninstall Sonar and all related plug-ins. Then, remove the Cakewalk Music Software references from the registry. You could use Regsrv32 to uninstall any plug-in .dll's that you have lying around. If all of that fails then, it's time for a Ghost image that is, if you have one or, a reformat and reinstall of Windows XP. Regards, Phil Muir P J Muir Productions Music and audio production URL: www.philmuir.com/ ----- Original Message ----- From: Cameron To: ddots-l@xxxxxxxxxxxxx Sent: Saturday, August 05, 2006 9:45 PM Subject: [ddots-l] Sonar error Hi. I installed the additional plug ins etc which are on the sonar 4 producer edition CD. However, now I'm getting an error when I try to run sonar. It says: Sonarpdr.ex error And then just closes. Sonar won't even run. What should I do? Thanks, Cameron.