Windows 95, 98 and ME are DOS based with some 64 kilobyte memory pools that when depleted will do as you noted.
No cure was ever found so we reboot every now and then.
Occasionally I get into a situation where unwanted lines start to fill up the screen until I can nolonger recognize anything. The only way I can clear this is to restart my computer. I have checked my computer and all drivers are up to date. I have a DELL computer and my OS is ME. Can anybody give me an Idea of what is happening and why.