What model of the Latitude is your notebook? BTW, Latitudes are known more for their ruggedness and ability to work on the go, a preferred notebook for business class users. That's why used ones, even those that are 4 to 5 years old, often costs just as much, if not more (still fetching $350 to $500) than brand new entry level Windows 7 based notebooks (typical 14 inch ones). They have lots of ports that's not offered on many consumer ones of today.
They're not known for their graphics, HDD size & speed, acoustics, or style. They're known for their productivity, can work in extremes, and are dependable. The ones that I had, all 4 of them, all ran hot, all were heavy. But they will take most anything that you throw at them.
Unless you have a fairly recent dual core Latitude, one that was built to run Vista at a minimum, Windows 7 won't run good on it. Drivers are getting hard to come by, especially the graphics for the older ones. TM brings up some points too, software/hardware changes makes a difference, both to the good & bad.
Post back with your model, processor & amount of RAM and we'll see what can be done.
Cat