[help] vista partition problem

i have a vista sp1 ultimate on 750 gb HDD. i know that i can create only four basic disks. in order to create more from the extended one, all the partitions becomes dynamic.

i read on the net that there is problem in reading dymanic HDD by some versions of windows and all there is problem in installing windows. is it true ?

and how can i convert all partitions back to basic ?

plz help ........