I dont know why i cant launch minecraft

Please help me this appears when i launch game ... i can log in and than Error occurred during initialization of VM
java/lang/ClassNotFoundException: error in opening JAR file C:\Users\Utilizador\Desktop\runtime\jre-x64\1.8.0_25\lib\rt.jar
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release