Help Me Techies! What Can I Do About a Lenovo Think Centre With Minimal Free Space on the Hard Disk Drive?

I have a Lenovo desktop with Windows 7 and a Pentium processor. Recently I have had trouble sending and receiving large files. Checking the file shows I have 5.76 MB Free of 287 GB on the hard disc drive. It has a Pentium R dual core CPU. What can I do so files can be sent and received more easily?
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