I installed limesurvey on XAMPP, and it was successfully running....I created a local survey (626571), in that moment I even exported to lss file....
Now don't know how to run limesurvey (remember it started before after installation)..... and I don't know how to find my survey....

You need to make sure XAMPP is running, then you open a browser and type in "localhost", this should do the trick, I guess.

By the way, the XAMPP version only server for developing and testing the survey, as it is only available on your computer. To publish the survey and make it accessible to other you need to host it on a webserver/webhosting.