The best thing is to use a different browser, of course that can't always happen. If not below is a release for Adobe about installing/re-installing the flash player which may help with the issues being experienced.
SUPPORT ALERT Do
you have problems installing or running Adobe® Flash® Player for
Internet Explorer? Most of these problems can be attributed to Windows
Registry permission issues. See our technical documents on Flash Player
and Windows Registry permission errors.
Download SubInACL from Microsoft to fix permission issues that prevent the Flash Player installation
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Flash Player may fail to install due to incorrect
permissions in the registry. Before you download the Microsoft tool and
follow these instructions, first read this TechNote "Troubleshoot Adobe
Flash Player installation for Windows" (TechNote tn_19166).
Additionally, if you don't have administrator access, then
you may not be able to install Flash Player successfully. Permissions
can be tricky but, in general, you should be able to install and use Adobe Flash Player if your system administrator gives you full access.
Windows administrators should be familiar with "Registry permissions
required for Flash Player install or update" (TechNote tn_19148).
Flash Player and other
programs may fail to install if there are incorrect permissions in the
registry or if there are missing ACLs for the Administrators group or
for the built-in System account. The Windows Installer service runs
with System account permissions. The installation will fail if the
System account does not have sufficient permissions to access the file
system or parts of the registry.
Using the SubInAcL
tool from Microsoft to fix permission issues in the registry has solved installation errors for several products including Flash Player.
following solution involves the Windows System Registry. Editing or
manipulating the registry incorrectly can result in serious system
damage which may require reinstallation of the operating system. If you
are not comfortable editing the registry, then take your system to a
professional. If you choose to proceed, then it is essential that you
create a complete system backup and a Windows System Restore Point
before proceeding.. Adobe Systems cannot be held responsible for damage
resulting from this information.
You must have administrator privileges to successfully complete these instructions.
1. Follow the instructions to download the SubInACL tool from the Microsoft Download Center.
2. Install SubInACL.
3. Download the reset_fp10.zip file.
4. Extract the reset_fp10.cmd file to C:\Program Files\Windows Resource Kits\Tools\.
Important: Be sure that both the subinacl.exe and reset_fp10.cmd files are in the
same location here: C:\Program Files\Windows Resource Kits\Tools\.
5. Double-click reset_fp10.cmd.
6. This will open a command window and execute the SubInACL tool.
7. Do not use the machine while SubInACL is running.
8. When it is finished you will see "Press any key to continue".
9. Install the Flash Player from www.adobe.com/go/getflashplayer.