all the drivers are for win XP, does not get mch "lighter" than that really. you could still turn off/delete all the crapware in windows back then and not have it come back everytime windows updates. if you have a valid key, you can try win 7 if you can find drivers for the features. you'll have to look up one by one the parts needed them and look on the product page for possible drivers. will take some hunting but you may be able to find them all one by one.
other than a light linux distro, there really are no other windows options for you. you can try linux if you wish but i have not looked at what is considered a light install vs a heavy install in quite a while.