Error: "File you specified cannot be opened" (different than "file specified cannot be found") Vista

I installed QB premier accountant 2008 on windows vista-I'm getting error message "The file you specified cannot be opened. Make sure it is not currently being used by another program or read only file. The Windows error was "The file exists"." I see similar posts for "file cannot be found" but my error is "cannot be opened". QB is open (no other apps are open) and this message appears immediately; you can see the following path above the title bar (home, customer center, vendor center, etc.): C:\Users\Public\Doents\Intuit\QuickBooks\Company Files\jeannette marie card designs.QBW - QuickBooks Premier Accountant Edition 2008, which I did set up (system defaulted to this path and I accepted it) when I initially tried to install previous to this try - on first try, I got thru 1st screen of Easy Interview and so did name my company file before same message appeared. I uninstalled and tried to re-install (system showed install was successful) and am getting the same error message right away now. There is only an OK button and no matter how many times I click it, same message appears and I can only "end task" or reboot to get out of the screen. I currently have Windows Vista and I believe I previously had Windows XP.