Environment Variables in Windows XP, Vista & Window 7

Most of these environment variables are same for Windows XP
and Windows Vista/7 but some are different. So we are listing them separately for XP, Vista & 7.

Windows XP Environment Variables

Environment Variable Path

%ALLUSERSPROFILE%                                   C:\Documents and Settings\All Users
%APPDATA%                                                    C:\Documents and Settings\{username}\Application Data
%COMMONPROGRAMFILES%                     C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)%             C:\Program File (x86)\Common Files
%COMSPEC%                                                  C:\Windows\System32\cmd.exe
%HOMEDRIVE%                                              C:
%HOMEPATH%                                               C:\Documents and Settings\{username}
%PROGRAMFILES%                                       C:\Program Files
%PROGRAMFILES(X86)%                             C:\Program Files (x86) (only in 64-bit version)
%SystemDrive%                                                C:
%SystemRoot%                                                C:\Windows
%TEMP% and %TMP%                                  C:\Documents and Settings\{username}\Local Settings\Temp
%USERPROFILE%                                        C:\Documents and Settings\{username}
%WINDIR%                                                   C:\Windows

Windows Vista and 7 Environment Variables

Environment Variable Path

%ALLUSERSPROFILE%                                           C:\ProgramData
%APPDATA%                                                            C:\Users\{username}\AppData\Roaming
%COMMONPROGRAMFILES%                             C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)%                     C:\Program Files (x86)\Common Files
%COMSPEC%                                                           C:\Windows\System32\cmd.exe
%HOMEDRIVE%                                                       C:
%HOMEPATH%                                                        C:\Users\{username}
%LOCALAPPDATA%                                               C:\Users\{username}\AppData\Local
%PROGRAMDATA%                                                C:\ProgramData
%PROGRAMFILES%                                                C:\Program Files
%PROGRAMFILES(X86)%                                      C:\Program Files (x86) (only in 64-bit version)
%PUBLIC%                                                               C:\Users\Public
%SystemDrive%                                                         C:
%SystemRoot%                                                          C:\Windows
%TEMP% and %TMP%                                            C:\Users\{username}\AppData\Local\Temp
%USERPROFILE%                                                   C:\Users\{username}
%WINDIR%                                                              C:\Windows


NOTE: Here C: is the system drive where Windows is installed in your system. It might differ for you if you installed Windows in a different drive in your system.