Vista - Keyboard & Touchpad Driver Problem

Keyboard and Touchpad Crashes with Windows Update KB 890830 -
Malicious Software Tool - March 2009.
After installing the above update on a Fujitsu Lifebook E 8410 Laptop
(Windows Vista Business) , I lost use of both my Keyboard and my Touch
Pad. The wired USB Mouse works OK. Used Windows Restore and the
system returned to normal.

When installing KB 890830, my Bit Defender 2009 Virus Scanner identifies a
Trojan.Generic.1487884 (file reference is US30Kbd2K.sys) in
C:\Windows\System32\Drivers and deletes same. Also, when running
Windows Defender on its own, Bit Defender again pops up and also deletes
file US30Kbd2K.sys.

My keyboard drivers are listed in Devise Manager as i8042prt.sys,
kbdclass.sys and US30Kbd2K.sys - the latter is possibly a trojan. However,
when US30Kbd2K.sys is removed (either manually or by Bit Defender) the
keyboard and touch pad will not work.

Can you suggest please how I might overcome this problem. I have curently
removed KB890830 (March 2009) from my system to keep it working.

Cheers