Don't worry! As stated on the windows packages downloads page:
The installer program in these packages has been known to trigger false alerts from some anti-virus programs. Please be assured that these warnings are false positives: the packages here are completely virus-free.
General help
Windows Moodle with Virus
این گفتگو قفل شده است و در نتیجه دیگر نمیتوانید در آن شرکت کنید.