Windows 7 My usb drivers are suddenly gone when i updated to win7?

ok, so installed a fresh version of windows to update from xp to windows 7 and all of a suppen my computer wouldnt recognize my flash drive, so i eventualy after trying other stiff that didnt work looked in device manager and saw that i was missing "USB 2.0 Flash Disk USB Device" and "Mass Storage Controller" and idk how to replace them, when i click update driver device manager stops responding. (a breif google search yeilded nothing) i realy need my music which is all on my flash drive aswell as the fact that i need my mouse which is also atached via usb so any help would be greatly apreciated THANKS!

model: toshiba satalite pro M300
os: windows 7 ultimate x32