Java, Safe Mode, and Scandisk troubles.

Today, I decided to run a scandisk and defrag. I clicked the boxes that needed to be clicked when running a scandisk, then I restarted. To my surprise, for the first time ever, Scandisk didn't want to run. It said something like "Windows doesn't have access to the volume." After that, I tried to boot into Safe Mode... I couldn't. It froze while it was loading up, several times. Around this time, I remembered I tried to install Java Runtime Environment 4.whatever (the newest) yesterday and it wouldn't install fully because it couldn't gain access to certain files, or something along those lines.

I'm running Windows XP Home.

Any idea what the problem could be? I have a feeling they're all connected in some way.

 

I discovered what wouldn't let me run Scandisk and boot into Safe Mode...

... it was Zone Alarm. I could run Scandisk and boot into Safe Mode just fine after I uninstalled it.

The Java troubles still occur, however. Below are some images of the errors I receive.

 

Maybe this will help http://java.com/en/download/help/error_1722.jsp

 

That fixed it. Thanks.