Hard Drive Almost Never Stops Spinning/Pecking

I have recently done a fresh install of Vista Business RTM on Dell 620
laptop, on a SBS 2003 network.

The Hard Disk Drive is about 80 GB with:

C:\ partion 49 GB (System, Boot, Page File, Active Crash Dump, Primary
Partion)

and 25.65 GB unallocated.

The Vista scores are:

Processor 4.8
RAM 4.9
Graphics 2.8
Gaming Graphics 3.1
Disk Transfer Rate 4.8

I don't like having my hard disk clicking away all day long. Is there a
probable reason for this? Where is the best place to start looking to
resolve? There must be some reason for this...

Thanks,

Boolean1