Yes, it is possible to add additional memory in Windows up to 2000 words. This can be done by installing additional RAM modules into compatible DIMM slots on the motherboard or by using a USB Flash drive for storing data. The amount of memory needed will depend on the application being used and can range from a few megabytes to several gigabytes. If additional memory is needed beyond 2000 words, a larger capacity RAM module may be necessary or a higher capacity USB flash drive.