Pro Tools 11.3.1 update problems! Lost files!

Hello,



I am posting this thread because I am having trouble with Pro Tools 11 after I did the 11.3.1 update.



This is the first update I have done for Pro Tools 11, and now I regret that I ever did the upgrade.



One major problem I am having is that I can not access any of my music files that I was working on in the original version of Pro Tools 11. I can't imagine Avid would make a update for Pro Tools 11 without being able to work on old files in the new update.



I am using windows 7 on my PC.



Has anyone else had a problem like this?



I can open a template but once I am in it does not allow me to access any of my projects from Pro Tools 11.0.1.....



I absolutely cannot lose these files for they are projects of bands I have been working with..



Anyone know how I can get my old files back? Do I have to re install the original pro tools 11??