Sorry the problems persist. Couple of more things to try; Do the filefind thing on *.arp under poser4 & see if ANY of the plugins are duplicated anywhere. Delete any older versions if found. Poser may be choking on a corrupted plugin, so fast it can't display the name before it freezes - try moving your plugin folder out of the Poser directory structure & booting it up. if it starts, that'll be a good indication it is, at least a plugin doing it. trial and error can narrow it down, then. Next thing to try is a bit more extreme, but it's what I once did, & worked out okay. Here it is; Open Win Explorer find the Poser4 folder - Right-Click on the folder & select properties. In a few moments, the total size of the Poser folder structure will display. Write that down if your explorer window doesn't show available free space at the bottom, right-click on the C:| icon for drive C & select properties again. that'll show you if you have enough space for what comes next - Compare the size of your Poser installation with the amount of freespace on the drive (or any other drives, if present) If you have enough space available, Create a PZRBkUp folder in the root drive (Or any other name you like) COPY all the folders (folders only) present in your Poser4 directory into that new folder. De-Install Poser4 completely. Take a few moments to run scandisk & optimize the drive Install Poser4 again from scratch Boot up poser to test installation, then install the 4.03 upgrade & boot up poser again to make sure it works (these will eliminate any possible hardware/driver conflicts as the cause) If poser works, create a SECOND backup folder & copy off the new folder structure there. Replace the new poser installation's folders with the original backup Bootup Poser to see if it works. If it does, all is well. If not, swap back the original folders from the second backup. (& make sure Poser starts okay again that way) Then swap back in the original backup folders one-by-one until Poser stops booting. That folder will contain the culprit! Very time-consuming - very laborious, but more likely to find any problems caused by Poser's own files. You might want to wait a day or so before trying that last suggestion, in case someone here has a simpler solution & posts it. Also; Have you reached Curious Labs Tech Support yet? They were able to answer a couple of questions I had within 2 business days in the past. - Fine folks, there. Anyway; Good Luck Again!