I can't find a Windows 7 64 bit driver for that. Call Dell directly and see if they plan to obtain or supply a driver.
I recently installed Win 7 64 bit (previously was Vista 32 bit) on my all-in-one Dell XPS A2010. I have tried to install A306 MiniCard pal/secam/dvb-t for 32-bit Vista (from Dell support site) but unfortunately Windows Media Center doesn't see TV tuner at all.
Also my media buttons beside CD/DVD slot doesn't work ether.