All of my projects are stating that they need 'X' amount of disk space and that I currently have 0.00 MB available. I went into BOINC options, computing preferences, disk & memory and in the box that says 'Use no more than X' I increased it from 5 GB to 10 GB. Under the disk tab, it states that totsl disk usage is 876.52 MB with 1.72 GB free.

How can I be getting messages stating that I have 0 MB available for all my projects? How do I increase the disk space available to run my projects because disk & memory apparently isn't it.

BOINC 7.6.9 (x64), Windows 8.1, numerous projects

Under the disk tab, it states that totsl disk usage is 876.52 MB with 1.72 GB free.

There are four values here, what are they all?

You say you changed it in the preferences, do you mean the ones on a project web site, or the ones in BOINC Manager?
What are the other two values here (Leave at least and Use no more than %)?

What is the size of the hard drive that BOINC is on?
If you don't know, can you please post BOINC its start up messages (from the event log under CTRL+SHIFT+E)? The first 30 lines or so will normally do.

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You need to check the other disk settings too, one of them is limiting disk usage to 0 GB. 'Leave at least X GB free' is likely candidate.