If you computer has a multiple core CPU , then you may try this small tip. With this, what you do is that you change the number of Processors that will be used during the boot up time. Multiple Core CPU’s (Core Duo or Quad Core) may not actually increase the speed. It will only increase the number of processor cores which would be involved in the process. This is known to decrease the boot time.
Procedure to follow
Click on Start -> Run -> type msconfig click ok
Now you Goto “Boot” tab and click on “Advanced options…” button.
Now click on check box next to “Number of processors:” and select the correct no. of processors from drop-down list.
Now click on “OK” twice and then “Apply” it.
Now you need to restart your vista pc and see the performance.