I recently upgraded vista to seven and even before I was getting a blue screen but was eventually able to boot up all the way. Now I am getting a blue screen like before but am not able to get booted, the closest I COME is getting to the desktop but before it can load COMPLETELY I get the blue screen. This is happening on a Dell 1737 laptop. Below you will find the results from BlueScreenView.

Dump File         : 102309-30903-01.dmp
Crash Time        : 10/23/2009 1:19:12 PM
Bug CHECK String  : WORKER_INVALID
Bug Check Code    : 0x000000e4
Parameter 1       : 00000000`00000002
Parameter 2       : fffff880`07c38530
Parameter 3       : fffff880`07c38550
Parameter 4       : 00000000`00000000
Caused By Driver  : mfehidk.sys
Caused By Address : mfehidk.sys+26a23
File Description  :
Product Name      :
Company           :
File Version      :
Processor         : x64

This is only one but the rest pretty much say the same thing.

Thank You,
  Mike

TAre you by any chance using MCAFEE anti-virus?HTTP://www.google.com/search?hl=en&rlz=1T4GGLJ_enUS216US216&q=mfehidk.sys+blue+screen&aq=0&oq=mfehidk.sys+bl&aqi=g1