LMS won't start anymore

Hi all,

suddenly my LMS 7.6 doesn't start anymore, Message: "Panic: Can't find temp dir for perlapp".

Same is with installation of 7.9, C:\Temp is existing.

I've made no changes to my PC, squeezetray.exe is set as an exemption with my Bitdefender. Any idea?

Brgds

Stephan