Invalid page fault in module RPCRT4.dll

Dear all,

I'm using Windows 98.
I have the following error message :

MSACCESS caused an invalid page fault in
module RPCRT4.DLL at 0187:7fbd0894.
Registers:
EAX=0063350b CS=0187 EIP=7fbd0894 EFLGS=00010216
EBX=0062f3d0 SS=018f ESP=0062f1f0 EBP=0062f3e0
ECX=7713ee58 DS=018f ESI=00000484 FS=4e8f
EDX=bff76855 ES=018f EDI=7713ef6e GS=0000
Bytes at CS:EIP:
ff 30 ff 75 d4 8d 85 1c fe ff ff 50 e8 cb 0b 00
Stack dump:
0062f714 00000000 00000000 0062f338 bff7a3a0 00000000 00000000 000ebf94
00000000 0040000c 00400000 00000001 00000000 00000000 8c7e07e0 00000000

Another error message :
MSMSGS caused an invalid page fault in
module RPCRT4.DLL at 0187:7fbd0894.
Registers:
EAX=006a31a7 CS=0187 EIP=7fbd0894 EFLGS=00010216
EBX=0069f06c SS=018f ESP=0069ee8c EBP=0069f07c
ECX=7713ee58 DS=018f ESI=00000484 FS=190f
EDX=bff76855 ES=018f EDI=7713ef6e GS=0000
Bytes at CS:EIP:
ff 30 ff 75 d4 8d 85 1c fe ff ff 50 e8 cb 0b 00
Stack dump:
0069f494 00000000 00000000 0069efd4 03973137 00000000 00000000 00000008
00000000 039730fc 00000008 00000001 00000000 00000000 9f260000 00000000

The error happens if I open every MDB file using Access 97.
The error also happens when I try to close MSN Messenger.
Besides that, in IE, the new window doesn't give result if I right click the
hyperlink.(open in a new window).

Another error also happens if I click Find menu (CTRL+F) from Internet
Explorer 6.0:
Error: 35
Incompatible version of the RPC stub.

I find this error has relation with Microsoft Outlook or Outlook Express
program. If Outlook program is not running, the invalid page fault error
doesn't happen.
I also have updated schannell.dll
(http://support.microsoft.com/default...b;en-us;315209) but the
error still occurs.

Please help me on this RPCRT4.DLL error.
Thanks.

Regards,
Vensia