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Windows Operating Systems Help Pages :
1) Windows Vista :- http://www.microsoft.com/windows/windows-vista/default.aspx
2) Windows XP :- http://www.microsoft.com/windows/windows-xp/
3) Windows 2000 :- http://www.windowsreinstall.com/indexwin2k.htm
4) Windows ME :- http://www.windowsreinstall.com/indexwinme.htm
5) Windows 98 :-http://www.windows98.windowsreinstall.com
6) Windows 95 :- http://www.theosfiles.com/os_windows/ospg_w95.htm