MY computer says I have no flashplayer and must install the latest version. Yet, when I go to the list of installed programs, Adobe Flashplayer Version 11.9.900.152 is listed as a program on my machine. If I try to reinstall it, it installs to the 50% mark and then quits. It says to close Explorer and then continue. I close Explorer and hit retry, yet it refuses to go on. It just keeps repeating the message that I must close Explorer but it is closed. How do I fix this problem?