Upgrading to SP2

Just downloaded SP2 for this great product but on runnning updatemanager.bat I came across this error:

"Please set the JAVA_HOME parameter in" updatemanager.bat

So i opened this file and checked the location it's looking for: C:\j2sdk1.4.2.03 but I have no folder there under this name. I did install this product on the E drive of my server so thought I'd check there. Nothing there either.

So I looked into the actual installation directory of ServiceDesk and came across this one:

E:\AdventNet\ME\ServiceDesk\jre\bin

Within this area there is a java.exe file but I'm not sure if this is the correct one to use as I still get the error although I've changed the .bat file to:

E:\AdventNet\ME\ServiceDesk\jre

I'm running this on a W2K3 server.

Thanx for any advise.