It's pretty painless to get the drivers and software back off the Dell site. Once you've altered the MBR you may as well write off the hidden partion(s) -- you can recover it (so that it works) but it's a faff.
When I got mine the hidden partion's image was set up wrong anyway so there's a fair chance you're not missing out on much.
When I got mine the hidden partion's image was set up wrong anyway so there's a fair chance you're not missing out on much.