HELP! :o( .... Can't install TS Client ActiveX controll

Hi,

When my clients (winxp pro sp2) tries to connect to tsweb (via web),
they get this error message:

"Remote Desktop Web Connection ActiveX control could not be installed. A
connection cannot be made without a working installed version of the
control. Please contact the server administrator."

When they enter the webpage, the ActiveX winxp-sp2-popup-blocker is not
shown and the error above is showned instead.

Any idea????

Thanks!

M O J O