cannot install hotfix from command line

I am running CF10 on a win2k8 r2 vm and trying to install  HF18,

I have the jar file in my hf-updates dir.

when I try to run java -jar hotfix_018.jar  from that directory I get a msg "Java" is not  recognized  as an internal or external command...

if I try and run it from jre/bin and provide the path to the jar file I get "unable to access jar file"

I have checked the permissions on the directories and I have full permissions on all directories and files.

I know some will ask if tried running it from within administrator, I am having issues with administrator but that is a separate issue

any suggestions on which direction I should go would be greatly appreciated.