[Nuke]

by default windows installs client for microsoft networks and file and print sharing, neither of which are neccisary to connect to the internet. aside from speeding up the boot process it keeps the hackers from coming in through microsoft's piss poor network interface. simply go into your networking panel and uninstall those components from the list. it should shave a few seconds off your boot time. dhcp can be disabled through the services panel, but i wouldnt disable it unless you know for sure your ip is static. most are dynamic.

another thing you can do to post faster, disable autodetection for drives in the bios. espacially for controlers not in use.

[Fineus]

Say I went to a LAN though, I'd want File and Print sharing for getting files from anyone else on the network though, wouldn't I?

[Nuke]

you need microsoft networking to use a lan, so in your case it couldnt be disabled, however if your network adress is static you could kill dhcp.

[Zarax]

Kalfireth, I suggest you a read at this guide if you want to spend a good bit of time optimizing your system... Looks good to me.

http://mywebpages.comcast.net/SupportCD/OptimizeXP.html