After Effects CC freezes during initiating mediacore and doesn't recognize Quicktime.

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hi everybody,
i've been  struggeling issue 2 days now, , i'm not sure do.
whenever open after effects, screen freeze during 'initiating mediacore'. takes 4/5 minutes , afterwards, if leave frozen screen alone, program wil start again.
the next issue that, once after effects has started, error message saying quiktime isn't installed , .mov aren't supported. strange because have quicktime installed , never had problem using .mov's before. unable import , export .mov files.

 

i've tried every possible thing find online not nothing had worked yet.

 

i have:
-restarted after effects
-restarted computer
-reinstalled after effects
-reinstalled after effects without upgrades
-reinstalled adobe realated (and used cc cleaner well)
- deleted quicktime
- tried out older versions of quicktime
- tried out replacement quicktime
- made different user account on pc , tried after effects there
- disabled firewall
- deleted preferences (<drive>/users/<username>/library/preferences/adobe/after effects/)
- deleted entire adobe folder (<drive>/users/<username>/library/preferences/adobe/)
- changed adobe folder read-only read , write

 

i upgrading windows 10 hope work.

 

i'm using:

after effects cc 2015 13.7.1
quicktime 7.79.80.95
windows 7
creative cloud 3.6.0.248


i hope knows

do have avg antivirus, chance?



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