Hi HarveySpecter and welcome.
The truth is, laptop computers are not made to be upgraded like the older Tower Desktop computers. Generally, all the components are matched to each other and of a similar performance. Replacing bits is not very efficient - best to upgrade to a new PC. Sony do not offer any upgrades.
Generally speaking only the RAM and the Hard Drive are upgradable. You already have the maximum RAM and a hard drive upgrade will involve reinstalling the Operating System and Software.
Replacing the processor is of course possible but not financially worth it - you would be better off saving up for a new computer.
You cannot upgrade graphics or chipset.
The best things you could do is UPGRADE to Windows 7 (Vista is cumbersome and slow) and consider a HDD/SSD upgrade (if you think it is worth the cost).
