It is possible to root again. If you search the forum you will find instructions on how to reinstall custom recovery using Odin method which will allow you to reinstall a rom of your choice . I just can't seem to find it. If I do I will let you know.

 

Try reinstalling the drivers. If your using XP see if you can find a windows 7 computer. It seems like people have better luck with 7.

 

I have the same problem and nothing is working for me either. Did you find a solution?

 

http://androidforums.com/transform-...wm-new-clockworkmod-fixed-no-2min-reboot.html use this <---- and follow step by step.

 

That's the best way of doing it

 

yeah just follow the guide Nite posted, Updating android usually always removes root because it replaces the old files, its extremely easy to fix if your computer doesnt see the phone in DL mode download the drivers again, it should see it, if not go into Device manager uninstall and let the computer recognize it.