||I've had the same problem. I was able to export the personal GDB feature class to a file based GDB that was introduced in 9.2. The file GDB has a 1 TB limitation while the personal GDB has a 2GB limitation to size. Using the file GDB the feature classes were repaired using the tool. Since you're still at 9.1, you may want to try exporting to a shapefile and run the Repair Geometry tool again. But as I found out reading other posts you may want to to export the data to a new shapefile, do some calculations using the field calculator, start editing - do something small and save the edits and the data will display correctly. The Repair Geometry for some reason damages the spatial indexing with shapefiles. You can also delete the .sbn and. .sbx files and the problem will be fixed.