Minecraft Java Virtual Machine Error
Note - Assuming your PC is a 64-bit machine -
Are you running 64-bit Java? I've been having a lot of issues running MineCraft on 32-bit java - The game will play fine for about 5 minutes and then lag out (checking the memory usage it gets to about 1GB)
I'd say uninstall Java, and then go to http://www.java.com/en/download/manual.jsp and select the 64-bit version manually.
If you want to check if your PC is 64-bit:
- Click Start
- Right-Click Computer and select Properties.
Under the System section it should say whether it is 64-bit.