In the UK there are still many students waiting for their funding for assistive technology. However, even Windows 7 has lots of feature that can be useful. For example, try using Speech-to-text. You can access details through the computer Control Panel/Speech Recognition, where you will find the following:
Start Speech Recognition
Start using your voice to control your computer
Set up microphone
Set up your computer to work properly with Speech Recognition
Take Speech Tutorial
Learn to use your computer with speech. Learn basic commands and dictation.
Train your computer to better understand you
Read text to your computer to improve your computer's ability to understand your voice. Doing this isn't necessary, but can help improve dictation accuracy.
Open the speech Reference Card
View and print a list of common commands to keep with you so you always know what to say.
And here is a short video that show a few details.
Speech-to-text on Windows 7