Try using a copy of Everest Home Edition (you can get an older freeware copy from Major Geeks:
http://majorgeeks.com/download4181.html).
Regardless, this page (
http://support.gateway.com/support/drivers/search.asp?st=pn¶m=3401701) has all of the drivers that you seem to be missing. A quick note: The mass storage controller is most likely the card reader.
Good Luck