Mouse and Keyboard not working after installing libusb... Please help!

I was instructed by a friend to use libusb and iRestore to fix a problem with my iPhone. Unfortunately I did not know that you were supposed to install the program in a certain way (via compatibility mode or something) and now all my usb ports are dead. Both my mouse and keyboard are USB, however, I have this little plug that you put on the usb, which turns it into a ps/2 port. I tried connecting the keyboard and mouse into the ps/2 plug but that doesn't seem to work either (is it possible that libusb disabled them too?)

I am using Windows Vista 32 so I put in the original Installation CD from Microsoft in hope that it would do something for me but that didn't help either. When I restart the computer it sometimes prompts me to go into safe mode but I can't take advantage of that since I can't use the keyboard. A few times when I put in the Vista CD in it prompt me to another similar screen but with a few different options one of which is to recover the system from last good backup or something along those lines (this screen however only came up a few times. The last time I restarted the computer with the Vista CD it did not take me to that screen)

I don't really know where to go from here with this. I have a lot of valuable documents on my desktop and do not want to lose them. Can someone please help me fix this problem? It would be disastrous if I were to lose my work because of this.

Many thanks in advance.