Recover Lost data after Windows Xp reinstall without Formatting

Hello,
Can U plz tell me how to recover My Lost data when i reinstalled My Windows xp sp3 leaving the current File system intact?
A new xp installation takes approx
6 Gb,My Windows Pertion Shows 11 gb Occupied.Is there any Chance that the data from the old Installation might be there?Searched The whole c drive but could Not find them

When you do the search, select hidden files, and make sure in folder options you turn on the ability to show hidden and system files.

Your data ( assuming you are talking about documents ) should be in a folder called C:\Documents and Settings\yourusername\My Documents. However, if you installed a new installation of Windows, it could have easily overwriten that if you used the same username. You may need to get a file recovery software and run a scan of your drive to see if it will find anything.

Windows reinstallation actually formats the drive in it resides and empties the file system. Without taking backup you can't retrieve data. To recover lost files from reinstalled windows you can use and download demo version of this software.