EM Client not a 32bit application error

When trying to open the paid version of Em Client I’m now getting the following error:
mailclient.exe is not a valid win32 application.

It’s been working fine until today. I’m on a Windows XP computer

How do I fix this problem.

Thank You,

please reinstall eM Client and let me know if it helped. Latest version of eM Client is available here: http://www.emclient.com/dist/v4.0.151…