How did you disable it? Just in the browser perhaps?
Will give you version information, unless it is already removed.
If it was installed when you installed Slackware 13.37 then:
should remove it. If that returns
ls: cannot access /var/log/packages/jre*: No such file or directory
No such package: /var/log/packages/jre. Can't remove.
Then it's probably not installed. At least not the Slackware way.
Now what to do about that file you downloaded. You need to get the Slackbuild in Extra from a Slackware 14 mirror, then build the java package. Here is an example on how to do that.
From your home directory:
# make a directory to do the work
# change to it
# download the files you will need in one shot
lftp -c "open http://mirrors.slackware.com/slackware/slackware-14.0/extra/java/; mirror -X *.mirrorlist"
# move jre-7u17-linux-i586.tar.gz in to the sunjava directory
# once that is done you are ready to build the package
# change to root
# cd back
# Then build the java package
## After a few minutes your will see Slackware package /tmp/jre-7u17-i586-1.txz created.
# next install it
upgradepkg --install-new /tmp/jre-7u17-i586-1.txz
# That's it
Or follow that link allend posted