Short answer: Yes, and VERY carefully... You really should get a good uninstaller program that sorts the DLL's and then searches for program dependencies. It should also back-up anything it does automatically, and not "trash" the system so you can use the back-up "when" you need it... The more aggressive the program in removing things, the more likely you are going to have trouble. Another approach is to format the hard drive and start with a "clean slate..." A third approach is to keep the system "lean and clean" by only putting in programs you "really" need, and using only "really good" programs that you don't have to get rid of because of problems. I would say you are doing fairly well in the "lean and clean" dept, as my system has almost 2300 DLL's. Rick Glazier ----- Original Message ----- From: "Ryo Imamura" <[log in to unmask]> > In exploring my hd usage, I found that there are 1387 .dll files. Can I > delete some of them? If so, how do I choose? Thanks. Curious about the people moderating your messages? Visit our staff web site: http://nospin.com/pc/staff.html