I have the Vostro 3700 with W7 Pro (32) and have had no issues at all with anything.
Only mouse problem I have come upon is the gesture support that drives me crazy, keep zooming in on things and scrolling.
Dell support is great (my experience) so give them a try, sure they can help resolve pretty quick.
Since purchase, i'v not had any updates or prompts for Chipset or BIOS, both are upto date, and I have double checked on the dell site, so maybe make sure you;ve the right ones, which I am sure you do? Some come in X86 and X64, maybe make sure you've got the right one for the right version of windows you have?