Final Analysis

Based on your input:

You are getting a message about Low Disk Space 

Conclusion: 

For Windows to work properly, it should have at least 2 GB of free space.  When getting below this amount the computer starts to have a lot of problems.  If you've already deleted as much as you can and you still have problems we can install a larger Hard Drive and transfer your files.

Quote for Parts, Labor, Taxes, Fees (all inclusive)

Part:  Hard Drives start at $75 and go up depending on desired amount of storage.  A very large drive is around $200

Labor:    Operating System Install with data migration

Alternative:

If you'd prefer to buy a new PC we can Transfer your Data