Usb Ports Completely Stoped Working

Not to long ago i had downloaded and installed windows 7 beta to my hp elite desktop and it seemed to work very good it was slightly faster than vista which was on it before but im also a gamer and have about 4 games on it and usually play with my 360 controller thruogh the usb port. Well while it was installing the driver for the controller it all the sudden stoped and said usb device unpluged so i jus said whatever and jus treid to use the keyboard and mouse but noticed my keyboard wasnt working so now i was thinkin great what now.

I tried all the usual things to get it to work even unistalling all the usb ports then restartin to let them reinstall to actually payin $40 for a pci usb card witch none of these things worked not even the new card witch was very agrivating cos it seemed to work for a few other people on some different forums. So my next step was to contact microsoft and let them know what my situation was and well they said they werent responsible for it and duh like i didnt know im the one that chose to install it this person acted like i was blaming them when all i asked was if there was a way to resolve my problem like maybe an update or somethin and thats the only thing i got from that dumb fckr witch was retarded.

so i sent another email sayin the same thing and a different person told me to look at the forums and said there most likely is a solution around but without finding one i decided to post this and i am new to this so forgive me if this is the wrong area for this post im also new to computers all i want is my pc to work good again i had to buy this dell labtop jus to find a solution because my internet is thruogh a usb modem.

And i forgot to add not one usb port works all of them in the device manager have the exclimation sighn.