Does windows device manager sees any kind of a transformer device?
If yes try to install the drivers by hand.
right klick on the device
choose update driver software
choose search manually on computer
next window choose from a list on computer (the one at the buttom of the window)
Then you will get a 2sided window
right side you have the company names
left side you have the model type
if you have something like asus ther on the right side choose it
then on the left side choose Asus android ADB device (!!!! not the one with Composite)
then klick on next
if a window pops up saying something like its not recommended just hit yes and install it anyway.
Translatet it from German, so I hope the translation is correct. Just follow the steps and you will know what I mean.
or, if you are only able to get Fastboot running you need the blob file out of the Asus update (it has to be placed in the folder were the fastboot.exe is) update and this fastboot command:
fastboot -i 0x0B05 flash system blob
I had to run the fastboot command more than 20 times, but finally it run through and i was back to stock.
for fastboot dl this package
http://www.4shared.com/zip/npKPgYok/WSG_UnBricker_Skript_no_Fw.html
extract the folder to c: and rename the folder to trecovery
open cmd
type cd c:\trecovery\
now you are in the folder with fastboot.exe
Than type the fastboot command