I have an old Atlas Flyer 3400, with the maximum 512m of memory. It runs Windows ME which is no longer supported by Microsoft. Can I upgrade the operating system, and if so, to what and where can I obtain the software at reasonable cost?
Your laptop is technically capable of running Windows XP but that will cost you at least $110.
TBH, with a laptop that old you would probably be better off running the free Ubuntu or another small footprint Linux OS.