Messed with kexts, killed kb/tp on brand new mac!!! help

ok, i was trying to disable mac's usb ports to see if that would let windows in Parallels get access to it (later learned this was impossible) so that I could read/write to an external ntsf hard drive. One method with SOME potential that I found on a very trustworthy anonymous website was to remove a kext file called IOUSBMassStorageClass.kext. I found this advice on numerous web pages which all also assured the keyboard and trackpad, etc, would not be harmed.
I removed the kext by copying it to the desktop, and then trashing the original. It... sort of worked. My mac no longer grabbed the USB, but Parallels didn't either. But I was still having the original error in Parallels, so I tried the same thing with the similar-looking IOUSBFamily.kext. Nada. Butkis.
Note: when I moved the kexts to the desktop, their icons changed to folders. Does this mean anything??
So anyway, it didn't work. So I moved both kexts back into Extensions. But then the Mac could not detect the USB port like it did before I did anything.
Note2: I am a relative mac newb and have no idea if this is the proper way to install/uninstall kext files. But I figured if it couldn't find the files, couldn't use them. And if they were returned, no harm no foul, right?
So anyway, I figured I needed to reboot, and now my keyboard and trackpad and anything USB related won't work. The only access I have is using the Install Disc to startup, where I DO have a working keyboard and mouse (just not when booting from HD) I can get into the terminal and tried various things with the IOUSB kexts but nothing worked.
So.... HELP ME PLEASE!!!!!!!!!!!
I now have, basically, a brand new, dead macbook!!
Is there any way to fix the kexts manually through the (limited) terminal, or from the install disc? Or..... am I way off here and it has absolutely nothing to do with the kexts?!?! oh god........
(sorry if too long)
Macbook   Mac OS X (10.4.8)  

Are you the person that's responsible for the increase in the price of my lawn mower because the manufacturer had to but a big sign on the cowling that says, "Danger. Do not place hands or feet under the lawn mower when it's running!" and had to redesign the cowling to prevent someone from sticking their nose (or hand or foot) where it doesn't belong?

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