Warning and Geek Squad Request
Even if you have the player installed, it could be that either your version is not up to date or isn't the right one for your browser: iExplore wants the "ActiveX" flavor of the installer, not the regular one. Normally, following the link provided by the "You need FlashPlayer"
box will set things right, but to stay on the safe side you can manually specify which version you want to download
If you already took care of that, as mentioned there're several settings to check; Adobe provides a detailed list and how-to
(see especially #4. Verify Internet Explorer Settings).
Further issues after that could be due to missing/corrupted files on iExplore or Windows system folders, not an unlikely scenario after virus/malware cleaning. If it's something minor, visiting WindowsUpdate (there should be an option from one of the iExplore menus, Settings/Tools/Preferences/Help... one of them) may help. Beyond that, it depends on where you want to draw the line between "User" and "Technician"