The three basic elements you may find with every Windows when it is ready to work
1) Icons
2) Start menu
3) Task bar
Icons and shortcuts may belong to any software that helps you to run your work and machine smoothly.
Please feel free to ask if you have further questions.
A simple letter could be typed using notepad or any text document. If you do not have office installed on your machine. However, few expert users use registry cleaner and PC optimizer software to analyze which program is less important and must be removed to free more space on the disk.