I am getting this error message jvm error 517 on my 9810, how do I fix it ?

show jvm error 517 n reset on screen . i press reset n it happen again n again . please2 .

You need to reinstall the OS...

KB30332-"JVM Error 517" appears on the BlackBerry Bold 9900 smartphone

Follow the steps in KB03621-How to reload BlackBerry Device software and applications using BlackBerry Desktop Software