10.6.8 how to re install the appleusbethernethost.kext?

i have been having intermittent problems where when i plug in my wd usb esternal drive (have used for a long time with no problems), it seems to cause a short or some problem with all the usb ports because the mouse and he keyboard and stuff will stop working and i'll have to unplug and replug them all to get them back up...and even that won't work sometimes and need a complete reboot....so that's been happening then today i got an error message when i restarted saying....
SYSTEM EXTENSION CAN NOT BE USED
the system extension "/system/library/extensions/appleusbethernethost.kext" was installed improperly and cannot be used.  Please try reinstalling it or contacting the product's vendor for an update.
so yeah...what do i do folks?  layperson here...so step by step without assuming i know anything would be super awesome!  :-)  thanks in advance!

ok, so now i have completed the steps and now the error message is gone about the ext having been installed improperly....but now the original problem i had before it escalated to that extension error problem still persists...and that is that any USB drive i plug into either my keyboard usb port, my front tower usb port etc, it causes all my other usb peripherals to fail...mouse keyboard, and i the "disk was removed before being properly ejected" or whatever that error is...so the drives won't stay connected and while they are physically plugged in they seem to lead to the freezing of other usb perpherals....so that problem still is going on...any ideas on why?  this is been a sporadic problem over the years..sometimes when it would happen i'd just reboot and it would seem to go away for a while before eventually always coming back and sometimes being more persistent and annoying like now...i literally can't keep either an external hard drive or a flash drive or any kind of drive connected long enough to transfer files.....
so what now:(

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