I tried everything. I cleared Illustaror with CC Cleaner, I installed Extension Manager to see if it is conflicting the instalation. It won't update =(
Also when I run Illustrator and there is a "New Features" pop up window, I click in "see all the new features", it popup a blank notepad and another system new message: "the filename, directory name, or volume label syntax is incorrect". When I try to use Typekit fonts it happens the same thing...
This happens with my desktop computer, my laptop is ok.
You have not provided any proper technical info, so nobody can know.
This may be one for Customer Care (tick I Still Need Help and hope for an agent available for a chat),
or for this specialized forum (where you may be able find the answer from previous threads),
or for Adobe Support (phone),