It seems like Windows XP doesn't recognize default icons of many applications in my old Dell machine e.g. Skype, Windows Live Messenger, Adobe Reader, Microsoft Office 2003. Though I can open all those applications, the most annoying part is that all files associated with them don't have icons too and I cannot get their types by glancing at their icons. Is there a way to fix this without reinstalling Windows and all softwares?

FYI I have tried TweakUI and cleared icon cache but it didn't work.