It first started with xampp, so I downloaded wamp, but it happened again.
After successfull start of mysql, I verify that in task menager, it freezes, and i can't do anything with it, I can't connect with myslq command from command promt nor using phpmyadmin and with xampp I can't even shut it down. Error message is: 2003 "could not connect to mysql server" or something like this. I tried to reinstall, both xampp and wamp, then checked whole registry with regedit and registry mechanic but nothing helped. Stangelly sometimes it works like nothing ever happened.