Cool, thanks Upgrading to IE6.0.2800.1106 has no effect. There was number of components wich failed to register during system settings update after restart and full stop. Explorer gives the same error messages and is not functional as it was. I read Microsoft article about this error, it said there has to be script5.6 or newer directX installed to fix it, but I did not yet figure out how to donload them and I think it is included in Service Pack, is not it? Maybe there is some other service pack ment to be installed over one I mentioned in my first post? Can it be there is bunch of components required to search here and there fo SP to run? How I hate this service pack... I need components from it like installer etc. How do I determine which component is faulty? The only way is to install Windows from scratch and install component by component to see which spoils the IExplorer. Probably the best way is to install it without "important" hotfixes. Final news: that Windows installation was faulty. I found different install disk - this works. Everything installs now without a single error message. And Google also works!