Ok, I solved it thanks to a lucky post here mentioning vssadmin briefly. That's all I needed to start trying out the command operators and figured it out on my own. So for anyone who is having a similar problem, much better than backing up your drives lol.
open up your command line and type
vssadmin resize shadowstorage /for=<driveletter> /on=<driveletter> /maxsize=500MB
500MB is the minimum, if you are using vista, disabling system restore's shadow copy feature may delete all of the files (not just resize it), and for server 2008 uninstalling the "server backup feature" may do the same thing.
An example execution would be:
vssadmin resize shadowstorage /for=x: /on=x: /maxsize=500MB
the drive letter should be the same for both, and you can't leave one operator out. after doing this, I gained over 80GB of HDD space back! YEAH!