Yes, CCleaner is a very good tool.
Just great for:
Getting rid of useless junk files.
Getting rid of broken shortcuts.
Cleaning out old registry entries and repairing other errors.
Suppressing unneeded installers.
Killing suspicious cookies from all common browsers.
For the jnlp files, they belong to the Java run time libraries.
Go to www.java.com and download the Java installer. It's that BIG RED button smack in the middle of the page.
Run it and you're good.
Both CCleaner and Java are free.
Electro
April 2011