It's a problem of your java installation.
Seems also strange that java was installed to your download directory.
Best way to go:
Remove all java runtime environment installations and do a proper reinstall.
There are probably multiple possible reasons and also faster solutions but it's hard to say which problem your system exactly has.
E.g.
http://stackoverflow.com/questions/6036462/running-java-gives-error-could-not-open-c-program-files-java-jre6-lib-amd64Maybe you have this problem (but maybe another):
I checked my environment variables - JAVA_HOME & PATH and they all refer to c:\java. So this was bit frustrating. After sometime I found that the default installation also copied java.exe, javaw.exe and javaws.exe to C:\Windows\System32 (i.e. uninstall of JRE didnt went well). I just removed them and voila, I'm back on track. That annoying error is no longer popping.