I used the open with dialog a while back and forgot to "uncheck" the box that says " always use this program to open" and now all my DLL files show open with notepad. Although programs still open I have been getting "Blue screens" shutting down windows and telling me to restart my computer, a lot lately. This started after I carelessly associated dll fils with notepad. I am running Windows XP Home sp2 NTFS. How do I reassociate dll files appropriately? and is this what is causing my "blue screen" problems?