First of all, make a current backup of your project and library files (but don't overwrite any old backups).Then, from the Utilities menu, choose Project and then Reindex.This will attempt to rebuild the index, but since you're also getting error 41, it might not work.
If you still have errors, try creating a duplicate project using the Save As/Project routine from the File menu.This will rebuild all of the files and hopefully correct the index error and the Error 41.
If you still get errors, you'll need to restore an old backup that doesn't have the errors..
As for the Error 43, this is a problem that occurs in certain lists on fast computers. That error was fixed in UFT version 2.9 and later.