Hmm ... this is an absolute guess on my part. Since the old computer was running XP, this is where you're supposed to find your data on the external hard drive:
- Documents should be in Documents and Settings\<your user name>\My Documents
- Pictures should be in Documents and Settings\<your user name>\My Documents\My Pictures
- Outlook Express mail should be in Documents and Settings\<your user name>\Local Settings\Application Data\Identities\{string of letters, numbers, -}\Microsoft\Outlook Express
You should be able to copy data to the corresponding folders in Windows 7.
However ... it may not work. Since the data wasn't copied to the external hard drive with a simple drag and drop or copy/paste operation, the file path may have changed or file extensions changed. From what I've read, Microsoft has always recommended using Windows Easy Transfer. And I have no idea if WET can be used to read and transfer files that were already transferred from the XP hard drive to a USB external hard drive via the XP backup program.
Windows Easy Transfer - Microsoft Windows
You may have to experiment. I found this advertisement for 3rd party software. DISCLAIMER: Information only. I have no financial interest in the software.
How to Restore XP Backup in Windows 7