Well your computer has two types of memory. There's your disk drive memory that's used to store files and whatnot. Then you have virtual memory, which is used to store temporary data while a program is running. When you have bots driving around and crashing together on your screen, that's much different from just having a bunch of .bot files sitting in your Robot Designs folder. While it doesn't take up any more disk space, the computer needs virtual memory to process all of that.
Same goes for any other program. The more advanced and flashy it is, the more memory it needs. So games typically need a lot of virtual memory to run. If you're low on virtual memory, you can do a couple things:
- Close any other programs you have running, especially memory hogs like Photoshop.
- Get a RAM upgrade. Computers don't generally come with all the optimal components and you can get a memory upgrade for relatively cheaply. If you have 1024 MB and no other programs running you should be fine though.