Should open *.stp with no trouble. ( there was a problem related to html report on some machines I think in v2010, easily overcome by setting Options to not create the report.)
Should open *.dwg with no trouble.
Should open *.sat with no trouble as long as set Options to v7 when saving.
Do not use the student version files.
You should not need to start over unless this is all you have (you do have the original files, Inventor or SolidWorks don't you?).