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