Hi Sébastien

I think in general the things to try are these:

1. Make sure any security/antivirus software you are running white lists Studio
   
   
2. Reset Studio.  Rename this folder (just add _old to the end or something, it's not important what you rename it to) and restart Studio:c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\14.0.0.0
   
   
3. Rename these folders to make sure you have no plugins installed at all
   c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\14\Plugins\Packages\
   c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\14\Plugins\Unpacked\
   c:\Users\[USERNAME]\AppData\Local\SDL\SDL Trados Studio\14\Plugins\Packages\
   c:\Users\[USERNAME]\AppData\Local\SDL\SDL Trados Studio\14\Plugins\Unpacked\
   c:\ProgramData\SDL\SDL Trados Studio\14\Plugins\Packages\
   c:\ProgramData\SDL\SDL Trados Studio\14\Plugins\Unpacked\

Then restart and if things are ok then add in any of the plugins you are running one at a time to see whether these are causing problems for you.  If this doesn't help then I think you need to log a support case.  If you don't have a support contract then use this link as an installation issue:

http://support.xl8.one

Just fill in the form and submit it. Make sure your email address is entered correctly or nobody will be able to get back in touch with you.

Regards

Paul