That is a WinME/IE 5.5 version of the file. I don't know whether replacing it will correct this problem or not. The method, unfortunately, is rather difficult.
I can e-mail you a zipped IE 6 compatible version. You will have to unzip it, copy it to a floppy disk. Then you will have to use a WinME boot disk to reach an a:> prompt. At the a:> prompt you put the floppy in which has dispex.dll and enter these commands:
ren c:\windows\system\dispex.dll dispex.old
copy a:\dispex.dll c:\windows\system.
Then remove the floppy and reboot.
You will have to PM me with an e-mail address if you want to try this.
For what it's worth you can see how we went head to head with this same problem in a WinME OS and only finally resolved the problem by doing a complete rip of IE.
http://forums.techguy.org/showthread.php?t=210835
If you go that route be SURE you have an alternate browser installed first AND are on good terms with System Restore. Create a check point after installling and using a new browser.