Recently I tried to use Eclipse but when I open it,it told me my JVM verion is too old
Incompatible JVM Version 1.5.0_05 of the JVM is not suitable for this prod
I doesn't know what did you do before, but you have to check :
The java version (according with your eclipse and its version). The JAVA_HOME path (jdk) in global environment variables. Try to change the runtimes environment in Eclipse.