First,
Posting the same thread three times is not necessary and it is frowned upon.
Second,
I assumed since it is a missing DLL that it is a windows problem, but which flavor Xp, Vista, Home, Pro.
I am assuming that your system complies with the minimum requirements for AC.
That information is very (extremely) important.
Third, options
1. Redownload the file and try to reinstall.
2. Verify that video card drivers are current for your system
3. Verify that you have Admin rights
4. Verify that your AntiVirus is not deleting or putting the file in quarantine.
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
another Moderator