How to access USB device if booted with Windows 7 64-Bit Recovery Disc


Hi all!
I just bought the Windows 7 64-Bit Recovery Disc and the and my PC boots from it as expected, but what a shame, I can not access a USB memory stick attached to it.
I actually expected this to work as it does on an other PC, but with 32 Bit OS. what do I have to do to get this access?

Please find below some information about my PC (sorry, it's in German, but I think you'll get it anyway):
ModellHP Pavilion dv7 Notebook PC
Gesamter Systemspeicher8.00 GB RAM
Systemtyp64 Bit-Betriebssystem
Anzahl der Prozessorkerne4
Gesamtgröße der Festplatte(n)466 GB
Datenträgerpartition (C:smile:390 GB frei (449 GB gesamt)
Medienlaufwerk (D:smile:CD/DVD
Datenträgerpartition (E:smile:2 GB frei (17 GB gesamt)
Datenträgerpartition (H:smile:89 MB frei (99 MB gesamt)
GrafikkartentypMobile Intel(R) HD Graphics
Insgesamt verfügbarer Grafikspeicher5093 MB
Dedizierter Grafikspeicher1280 MB
Dedizierter Systemarbeitsspeicher0 MB
Gemeinsam genutzter Systemspeicher3813 MB
Auflösung des primären Monitors1600x900
Auflösung des sekundären Monitors1920x1080
DirectX-VersionDirectX 10
Whether or not the WinPE environment of our repair CD has USB support is based mainly on your BIOS and what type of USB support it has.
Perhaps. You'd have to contact your motherboard manufacturer for the USB chipset drivers.