Let's start over here.Windows 7, 32-bit java, Microsoft Security Essentials. In that order.
First, read the trouble shooting steps in my signature. Follow them exactly. If your problem persists, please post the log from your console (if it appears) or see if it is generated in the root directory of your install folder. We want specifically the log that provides computer information at the top, not the one that is filled with .giu. lines (this one, I believe is called the extended log, it's not much help)