>>I put IE 6.0 on all PCs and UT works well everywhere
>
>We have more than 60 computers in the office. I can upgrade my personal PC, but I don't think, I can upgrade others...

I download IE6, it is about 26MB and put in on the server in install directory and send message to all to install it. For two days in brakes, they do it. Installation takes around 10 min.