Folkguy11, I do not think the 2011 files could have harmed your BIAB program or computer in any way unless your friend's computer transferred a virus to yours, but Noel's suggestion of Opt., Return to Factory Settings is something to try first.

About the beginning of your post, that the 2011 files would not work on 2010, this is understandable if your friend's songs used RealTracks. There were changes to the way RealTracks are handled in 2011. If you've been following any of the threads from folks who did upgrade to 2011, you will see that there is a lot of discussion about whether or no one can "erase the +/- files" after upgrading. 2011 uses a different algorithm that, if your PC is fast enough to handle it, does not use 2/3 of the RealTracks files, and they can be erased for a tremendous saving of disk space. However, a trade-off for this change is that BIAB 2011 files are no longer backward compatible with earlier versions of BIAB.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.