help with T60, missing Universal Serial Bus controllers in

[etherburn]

Need help I have yellow exclamination marks on my USB controllers which are on the Intel(R) 82801G(ICH7 Family) USB Universal Host Controllers 27C8 to 27CA. These are located on the Device Managers in Windows XP. I tried to add new hardware but it shows that the device drivers were corrupted or missing. How do I fix this problem?