Set Product Options to yes in the Modules section
Add a new product - called Custom PC Build
Add a new option class for each part of the component for that PC ie:
HD size (with options each showing the price differential over the basic unit/setup)
Then when the customer views this product in the shop they will have several drop down boxes with the available choices and showing the price impact of these.
When they have made their choices and added to cart the decription in the cart and on the order will show all of the options that they have chosen:
eg:
HD 60 GB
Soundblaster Soundcard
Leadtech 4600ti Graphics
etc
hth
__________________
ex x-cart guru 
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