Thank you very much for help. I didnt paid for membership becouse I wana first to install program and to see it and than to take membership. I hope that I will find something to fix this problem.
Yes! Games and other programs working properly. Dont know why I cant run AChat. I update all stuff for graphics before a month. Thank you very much for your help. If there is something more to try I would be so thankful to hear and to try.