|This is the default location of the outlook.pst file....but it depends on your OS.|
If its XP - C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Outlook\
Win 7 - C:/users/"your computer name"/appdata/local/microsoft/outlook
Copy the outlook.pst file to the oulook folder as shown in the path above according to you OS.
Then open outlook.