@SXScarecrow
There are no error logs. I have enough allocated RAM, but I only get the choice of 1GB. No, I don't have a server for Tekkit. Like it says, I only have 32-bit Java with a 64-bit operating system. I'll try to get 64-bit Java some other time. And the time collapse before crashing is like, 1 minute. Forgot to add this in, but it always deletes what I built before the crash and keeps what I built from 30 or more seconds ago. For example, I was building a rocket and I was building a coolant supply. I hooked everything up and then Tekkit crashed and when I logged back in, the only thing left was the coolant tank, the coolant supply, and some pipes leading to the coolant supply, unfinished.