Vista installation. i have window xp on my 'c, drive which has only 2 gb space left.my d has only

Question

i have window xp on my 'c, drive which has only 2 gb space left.my d has only 5 gb left out 80 gb sata hdd. now i am installing new window vista on my 2nd hdd which has 250 gb space, but after few steps it asks for drivers
which are not in my cd. how should i continue