Dell is pretty lazy about linking
drivers and supporting out of warranty computers.. The alps touchpad in the latitude D620 is identical to the one for a D630 (and probably an inspiron 1525 for that matter), as is most of the other hardware, yet Dell blatantly tells its customers that a D620
won't run windows 7. They don't say they won't support it, their techs actually tell their customers a D620 won't run windows 7. The answer is to find another model that
is supported for 7 with the same hardware as your computer, usually by searching for drivers in a slightly higher model number