Click the Windows Start menu (usually
located in the lower left hand corner of the screen).
NOTE: On Windows
Vista, the Start menu is not labeled with the word "Start".
Instead, it displays only the Windows logo.
Select the Run command from the Start
menu, type msinfo32 into the Run dialog box
and then click OK.
NOTE: On Windows Vista there is no
Run command. Instead, you should type msinfo32 into the box
containing the phrase "Start Search".
A System Information window appears.
Examine the value of the OS Name item.
If OS Name includes "Windows XP", "Windows Server 2003" or "Windows Vista" you have Windows XP or
For Windows XP, examine the value of the
Version item. You have Service Pack 2 only if Version
contains the phrase "Service Pack 2".
Otherwise you have an older version of Windows.
For Windows XP, Windows Server 2003 and Windows Vista, examine the value of
the item System Type. You have an x64 edition of Windows if
System Type is "x64-based PC".