there is a configureation file...
I cant remeber exactly where it is so it might be best to start term and type [locate grub]
Anyone else thinking of duel booting, it's imperitive that you install the windows OS first becayse Linux recognises the windows installation and adds it to it's boot loader list so tht you can chose what to boot into.
Windows however sees the EX2 partitions and marks it as unrecognised, then overwrites the linux boot loader.