unstable Domain error 404, please Help me...

Hello for all, i have a problem with my elgg. I have installed ellg on XAMPP, and all works fine until goes offline without a reason. I don´t now why that hapens, after a few hours, with no errors, the server goes down with a error 404 in internet explorer. And i don´t do nothing, just wait a few hours and the elgg appears with all those features. Please if you can help me i will be greateful forever, i depends on this work for my future. Please if you no about this unstable service, who gives this error, help me....please..please

THANK YOU

*sorry for my bad english ;)