Client not loading?

Idk why but the client wont open anymore for me.
.lang.noclassdefffounderror
"the system cannot find the path specified.
Exception in thread 'main' java.lang.classnotfoundexcept: client
at java.net urlclassloader$1.run

etc etc

wtf is wrong

Happened to me, had to my environment variables again, simply go to

system > advanced system settings > environmnt variables

Then edit classpath to ;C:\Program Files\Java\jdk1.6.0_20\bin;.

You may have to download the latest jdk.