Check the guide on Vista on tweakguides.com
Here there are all drivers listed with a guide on what services a common user should disable. Vista and Windows 7 drivers are the same (98%) so you cannot go wrong using that guide.
Other than the services the guide suggest to disable there are some others as superfetch and readyboost that can give you quite a boost depending on what you use the PC for.
Usually the most HDDs intensive tasks reside in the indexing, online problems' resolution, defender real-time, superfetch, readboost and so on. Again check the guide on how to correctly configure them to speed the system up.