Ah Frances I have seen that exact error before with Turbo Tax. Most of the times is means a file in the 2011 program (not your tax return) has become corrupt.
However there are a few things we can try
First. Try Right Clicking
the Turbotax icon and choose Run as administrator
If that does not work, the only other thing that may work would be a repair install. It may or may not require the TurboTax CD. If it does no worries. I did manage to track one down that is very cheap and it will fix the issue.
To do that
Hold the Windows Key
(looks like a flag on your keyboard) and press r
In the run box that appears type in appwiz.cpl
then push enter
Click TurboTax 2011
in this list then click Change
Try the Repair option
If is still does not open I recommend getting the 2011 copy. I found it for 11.00 with free shipping on this pagehttp://www.incometaxdepot.com/product/turbotax-2011-basic-federal-e-file
This CD will repair the corrupt files and allow you to open the 2011 return.
It's ashame that Intuit does not allow you to open a 2011 Tax Return in TurboTax 2012. That would make things a lot easier.
If you get the CD and need any help please reply here anytime and i'll be here to help you in any way I can Frances.
If you have a moment don't forget to rate my help below (an excellent service rating
is most appreciated)
Also if you need any computer help in the future, you can return to this chat anytime day or night (I am online from 9am est until at least 11pm est every day of the week)
Thanks again for all you patience