I think it depends how you backed up the data.
You have two options - use the software in Vista to restore everything or manually copy folders over
if you used the software in vista - Complete PC Backup - you can't select indivdual files just the whole backup....You can access it from the Backup and Restore Center by clicking Start | All Programs | Maintenance.
OR Backup Status and Configuration page by clicking Start | All Programs | Accessories | System tools.
The other method will take more time but you have more control...
Hope this helps