Look in server.bat for the classpath definition that includes the string:
"Program Files\webMethods\IntegrationServer4\jvm\lib\rt/jar;C:\Program
There should be double quotes around the entire classpath in order to keep the classpath with embedded white space as one parameter to the JRE.
Is this the EWS Bundle eval?
Did you just download it?
Strange that this bug wouldn’t have been found by every user.