Installation Error

I cannot install Avast. I keep getting illegal operation error and then closes befor installation is completed

AVAST caused an invalid page fault in
module KERNEL32.DLL at 0167:bff7a3d4.
Registers:
EAX=00ed423c CS=0167 EIP=bff7a3d4 EFLGS=00010202
EBX=00008004 SS=016f ESP=0078f490 EBP=0078f4ac
ECX=00ed9048 DS=016f ESI=00ee9050 FS=4b5f
EDX=00ed9048 ES=016f EDI=00008004 GS=0000
Bytes at CS:EIP:
80 24 3e fd 83 7d f0 00 74 61 83 7d f4 00 74 45
Stack dump:
00ed000c 00ed0000 00ee9050 00000000 00000000 00000ef1 00000eea 0078f4d4 bff7a550 00ed0000 00ee9050 00008004 00000000 00008000 00008000 00000000

Any help would be appreciated

The error 0167:bff7a3d4 is generally related to NAV bad uninstalling?
Did you have Norton Antivirus in the past? If so, how did you uninstall it?

Welcome to avast 8)

:frowning:
I have the same problem and I never had NAV on this computer. There was an ancient version of McAfee installed, which I uninstalled via the control panel.
Did you find a solution to the problem? I’d be grateful for any help… My error message is

VAST caused an invalid page fault in
module KERNEL32.DLL at 015f:bff78a05.
Registers:
EAX=00f6423c CS=015f EIP=bff78a05 EFLGS=00010202
EBX=00008004 SS=0167 ESP=007bf490 EBP=007bf4ac
ECX=00f691b8 DS=0167 ESI=00f791c0 FS=0f1f
EDX=00f691b8 ES=0167 EDI=00008004 GS=0000
Bytes at CS:EIP:
80 24 3e fd 83 7d f0 00 74 61 83 7d f4 00 74 45
Stack dump:
00f6000c 00f60000 00f791c0 00000000 00000000 00000f81 00000f7a 007bf4d4 bff78b81 00f60000 00f791c0 00008004 00000000 00008000 00008000 00000000

In fact, the problem could be due to other antivirus (conflict).
Is there any other application (standalone) to remove Registry keys left behind by McAfee?

I tried Google with 015f:bff78a05 but did not succeed… :-[

Will this help? http://support.microsoft.com/kb/197388/en-us

for norton antivirus, there’s a removing tool provided by norton (serach in this forum !) :wink:

it solved the problem on my mother’s computer wich didn’t want to install avast because of a previous install/desinstall of NAV