I'm not sure what you mean when you say your phpMyAdmin crashed. It's just a web application, so normally if it encounters trouble connecting to the MySQL server it will give an error message. If the PHP interpreter or Apache server have problems, those would generally be recorded in the log file. I suggest you look through your Apache and MySQL error logs to see if there's a hint about what's going on. Do you get an error message or is it just a blank screen?
You can save your databases without phpMyAdmin by using the MySQL utility mysqldump
. I use it to generate SQL dump files of my databases for backup with mysqldump databasename -u root > databasename.sql
(though that's on Linux I believe the exact same syntax works on Windows, as long as mysqldump is in your path).
Also as Dan stated, it's strange for you to have two MySQL servers of different versions installed, it could be that there's a conflict there.