well can you read the label on the pc and give us the system SERVICE TAG number ? that will give us the details of the unit. and then we can make suggestions
top of head suggestions:
1. Download windows 10 install it on unit without registering it, donate computer to outreach foundation that provides computer to low income elementary kid so they can use internet and do their homework for schools.
2. Turn it into a NAS server with FREE NAS
3. Use it to run SETI and help researchers find extra-terrestrial proof of life among the stars.(https
/setiathome.berkeley.edu/)
4. use it with https
/www.planethunters.org/ and scan for planets in space
I could go on like this ....