Java has a very serious vulnerability that enables hackers to take over your computer. The last time this happened, it was a Mac problem, and it caused serious trouble.
How Install the Update
If you use Java you will most likely see an option for an update. If not, just go to www.java.com and install the software again. Again, this will be ready on Tuesday.
Unless you want Ask.com installed, remember to uncheck the box, if you reinstall from java.com.