Uploading project back to server

Three people are working on one project. There was some problem in check-in/check out and now it is currupted on one computer. Running copy is there at other two computers but as those are not latest sync versions so it can not be uploaded to server again. The only copy which can be checked out is currupted one and it is of no use to check out and check in from it.

All we want to do is upload whole project from any of other two computers to server so that it can be synced to corrupted one.

Thanks

Smita