Intro -- Since the registry is base for windows OS and stores all the settings of the programs,frequent cleaning is necessary to make the computer free from errors.Error messages regarding to dll,startup ,blue screen ..etc doesnt appear after the registry is cleaned. Note - Even if you dont have problems and your system is performing well scanning them with reg cleaner makes the system much stable,crash free and fast. I have studied above 6 registry cleaners and wise registry cleaner is the best among them, because -- it detect's more no of errors than others,they update frequently(means less bugs).A feature of wise registry is one click scanning and fixing of errors(a sepearate icon for this appears on the desktop) which others doesn't have. Search in google for wise registry cleaner and download(i am unable to give link bec of forum restrictions) -- freeware Now,even after fixing the errors with wise reg cleaner,if u are getting errors ,download "regorganizer" ,open it and search for the program name,with which u are getting errors in the "Registry search and replace",then check all the entries and delete and restart the pc. Also disable error reporting-- press windows+break ,select advanced tab click "error reporting" and select "disable error reporting". raama---hari--from india