Restoring back up from usb hard drive after pc restore problem

Hi guys i have recently done a restore on my wifes laptop dell inspirion 640m running xp home edition following word for word from the following link

 http://support.euro.dell.com/support/topics/global.aspx/support/dsn/en/document?docid=181316

i now have a problem when it gets to step 4 backups again follow all the steps and i get  this message

The location that you specified does not contain infomation. Please type a valid folder path into the edit box

if you entered a path to a folder on a removable disk, the disc must be in the drive

can anyone shed any light on this for me or tell me where i am going wrong

many thanks in advance