You can't upgrade a laptop to USB2. Even if you were able to do board level repairs the firmware is not able to support USB2 nor are there any controllers available to do this. If you really need USB2 you'll need a new laptop.
I am considering upgrading to high speed usb ports on my laptop. I have no hardware installation experience so I would be paying to get the upgrade done on my thinkpad...unless it isnt very difficult to do it myself. If you reccomend getting it installed...how much can i expect to pay? Thanks