I can't use my MT and many messages of error even in others project with other MT (for example of my client)à

I can't use my MT and many messages of error even in others project with other MT (for example of my client)à
Hi Helen,
Take a look here:
The translation memory data file is corrupt
If that is not the error message you've received, or the solution offered does not solve your problem, take a look here:
Repairing your installation of Trados Studio
There are several possible reasons for the memory corrupt message, try following the list of solutions offered one by one and hopefully you will be able to solve your problem.
If none of the above works or the instructions are too difficult for you, come back and ask for a support case to be set up for you.
All the best and a Happy New Year,
Ali