If you have XP and the Service Packs, or Vista, then USB2.0 drivers will be already available.
Your MSI mobo model number appears to partially fit this specification:
but I can't find it on the MSI website, which is usually excellent at providing support (I have an MSI board).
You need to check the motherboard model again.
Try again, this time using SIW which can be downloaded from:
Scroll down to Hardware and click on Motherboard after opening SIW.