(The file is damaged oder not readable)

(The file is damaged oder not readable)

When I ty to start Thunderbird an error-window pops up, saying: C:\Programm Files (x86)\Mozilla Thunderbird\thunderbird.exe Die Datei oder das Verzeichnis ist beschädigt oder nicht lesbar. (The file is damaged oder not readable) What to do? Can I simply download & install a new Thunderbird version? Had the same problem with pdf-files and a new installation of adobe reader helped. Did run Ccleaner freeware yesterday after quiet a while and now this problem occured for the first time. Btw: I also get this error-window: C:\Users\Enver\AppDataLocal\HostAppService\Engine\HostAppServiceUpdateManager.exe Die Datei oder das Verzeichnis ist beschädigt oder nicht lesbar. (The file is damaged oder not readable) Thanks for helping!