Need Help! CC storage problem!

Hello all , and thank you in advance for whatever help you can provide. I use Mac, primarily, but recently have had the need for new software that runs only on windows.  I have used a virtual machine before, but really didnt like it.  So, I pulled out a windwos machine that i bought last year and have fired it up.  It is never been used. 

My first order of business was to install Creative cloud.  In doing so, after logging in, the files synced to the machine and have now filled up the memory.  This wouldnt be a problem as i typically would be able to move the sync location to an external, but, CC is telling me that it needs to update.  When it attempts to update, it says that it cant because there isnt enough hard drive space. 

I would now like to remove everything from the PC, and attempt to re install CC and change the sync locaiton at that time, but i am terrified that i am going to delete my files locally, and also off CC.  I have 5 years and 90 GB of business related files, which would essentially ruin my existence if they were lost. 

Thank you! 

Matt