Just to copy files to an USB Stick didn't makes the stick bootable!
You could create a USB Stick bootable with Vista using the command window of Vista or Windows 7:
1. Open RUN as Administrator (you could hit the WinKey + R)
2. (type the follwin command all ended with hit Enter) cmd
4. list disk
5. select disk (use that number of your USB Stick)
7. create partition primary
8. select partition 1
10. fo0rmat fs-fat32
Now you'll need to have the Vista DVD in DVD Drive.
Assume the dvd drive is drive D:\ and the newly formatted USB Stick is drive E:\ you'll need to run the followin command from Command Windows: xcopy d:\*.* /s/e/f e:\
Set the Bios of your Laptop for to boot from USB, place the USB Stick in an USB Port and start your laptop. Now you should be able to "erepair" your laptop.