Installing QuickBooks 2012
If you're upgrading to QuickBooks 2012 it's a good idea to install the new version in addition to (not in place of) the old version by changing the installation folder to C:\QB2012 during the install process. Then, when everything is working properly you can remove the older version. You can create a folder for storing your 2012 company files, e.g. C:\QB2012\CompanyFiles. Creating a discrete location for your 2012 data file prevents QuickBooks from storing files from multiple versions in the same folder.