>We are trying to upgrade an NT4 SP3 PC from IE3 to IE4.01.
>During installation, we click on 'YES' to agree to license agreement, then the installation quits. No errors, nothing. It's an HP vectra PC. HP supports says they have heard of this problem but has no solutions.

I am running NT4(SP3) on an IBM. Have installed IE4 and IE5 successfully. One silly question... are you the local admin? Also, have you though about making the jump to IE5, you might have more luck.