Internet Explorer 7 beta: problem!!!

[hermitage]

I have installed ie7 beta from digit's CD/DVD. But when I tried to browse the web using that, it says "InternetGetSecurityInfoByURLW not found in WININET.DLL". I have ie6 setup file, which i tried to install back but couldn't since it says to uninstall ie7... I couldn't uninstall it, since it doesn't show up in Add/Remove Programs (updates has been checked).. what do i do?

Microsoft website has nothing about that..

Maybe someone could help.

By the way i am browsing now with Opera, which is quite ok, but maybe due to ie7 problems, i can't access MSN messenger and hotmail.

[hermitage]

I tried what was given in the discussion forum in Microsoft website, nothing happened!!