I've been struggling with the COM Surrogate dllhost.exe error messages for a while now. They always occured in a window that had thumbnails (NOT video thumbnails, just the thumbnail view, with icons ex: control panel). I think I have it all figured out. I found a million results stating it was a codec issue, but that is not the case for me because I have none installed, plus there's no windows icon codec lol. So I did my own messing around and uninstalled Adobe CS3 Master Suite. Opened control panel and voila, no error. Problem is, as a web designer I use CS3 like toilet paper, so thats not the best fix. So I tried CS4 to see if the problem didn't exist with a newer version. After it was finished I opened control panel, and sure enough it errored again. So I went into the Programs and Features from the control panel and removed the following programs from CS4: Version Cue, OnLocation, and InDesign. That seemed to completely stop any and all COM Surrogate errors I have had. Let me know if this does/doesn't work for anyone else.