If you are very much conscious about your space on hard drive, then a good idea would be uninstalling some unwanted application of windows such, which are never used, like Windows Messenger, but can’t find them on Add and Remove list, then try this one open notepad and open the file located in SystemRoot ( generally c:/> ) /windows/inf/sysoc.inf, once you have open the file then find the word “hide” in the file and simply delete it.

Now go to Add and Remove programs, Find the application, and uninstall it. Alternatively you can use this one to uninstall window messenger, click on run (start>run) now put this line and hit enter to uninstall windows messenger:
RUNDLL32 ADVPACK.DLL,LaunchINFSection %windir%\INF\MSMSGS.INF,BLC.Remove

Similarly to install back windows messenger just run this line:

RUNDLL32 ADVPACK.DLL,LaunchINFSection %windir%\INF\MSMSGS.INF,BLC.msmsg