Sony vaio hdd partitions

Hi,
I have a Sony Vaio that has a hard drive partitioned into a c and d drive as
well as the hidden recovery partition. I want to delete the d partition so I
have one larger drive because the c partition only has 13gb and the d has
40gb. Is there a way to do this without having to go through the hassle of
making a ton of recovery cd's? I tried to do a chat wtih Sony but there timer
ran out. Maybe delete teh d partion using disk manager then doing a recovery?
Thanks,
John