I presume you registered.
The only thing I can think of, is you did not accept their cookie.
For Internet Explorer 7: to check, click on tools, then internet options, then privacy, then sites.
On the per site privacy actions screen:
search list of sites for genealodzy.pl or geneteka.genealodzy.pl. If there with "blocked", right click, select "allow". Click Ok.
Click OK on the internet options screen.
Refresh the geneteka screen and try again. Good luck.