See if this link helps:
An unexpected error has been detected by HotSpot Virtual Machine - 1.5.0
It advises that you install the latest Java Runtime Environment (there is a link). If you can uninstall the JRE without uninstalling HotSpot, I would do that first.
Just so you know, some people have been having trouble with the latest version of Java. If version 1.6.1 (the latest) doesn't fix your problem, try using this version:
1.5.11.
Good Luck
Dan