crash due to running out of memory, already using batch file to limit to 512, system monitor showing javaw.exe keeps grabbing more memory until all is gone

Put the summary of the bug you're having here

What I expected to happen was...:
javaw.exe would not keep taking up more memory than allocated

What actually happened was...:
minecraft seems to keep grabbing more memory until my system runs out and then minecraft crashes
sometimes the hs_err file is created, I have attached the latest hs_err file in attachments

Steps to Reproduce:
1. Every time I start up minecraft and after I choose a world or multiplayer server, it starts to grab more memory
2. This does not happen on my two other machines running Vista and XP Professional