It Worked!!
I was able to run disk clean up.
After entering the command "sfc /scannow" I did get a message (down below) saying that there were some corrupt files but I am assuming that this is not much of an issue. I tried to view them but was unable to do so.
I think I still want to try the re-sizing of shadow storage as well. What do you think about me trying this (from my earlier post)?
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Thought about typing in:vssadmin Resize ShadowStorage /For=C: /On=D: /MaxSize=900MB (basically exchanging a D for the C in howtogeek's directions, but thought I'd better check with you first, since this is waaaaay outside of my comfort zone.)
Thanks for your help!
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Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.
C:\Windows\system32>sfc /scannow
Beginning system scan. This process will take some time.
Beginning verification phase of system scan.
Verification 100% complete.
Windows Resource Protection found corrupt files but was unable to fix some of th
em.
Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For example
C:\Windows\Logs\CBS\CBS.log
The system file repair changes will take effect after the next reboot.