Although Adobe has their own page for troubleshooting this issue (see below), they did not work for me.
After some troubleshooting this is what worked for me…
While trying to install adobe flash player activeX for Internet explorer (any version), the installer and/or uninstaller hangs when extracting files from the package downloaded from adobe.
The installer would hang at “extracting files to c:\windows\system32\macrod\xxx”
For some odd reason by terminating a process with a .TMP extension allowed the installer to complete.
The same may work with the uninstaller problem.
Some other tips that have worked for others:
SIDE NOT: on one machine there was major HD activity but the installations finally finished but took 10 min