To fix this error you have to do the following:
#1 Log on to the server as Administrator.
#2 Download flash uninstaller: http://kb2.adobe.com/cps/141/tn_14157.html and run it, if necesarry reboot.
#3 Download and install flash player.
#4 Start regedit and locate the following keys:
#5 For each key / folder do the following:
Rightclick and click permissions, remove ‘everyone’ from the list and click on ‘Advanced’, click on ‘Replace permissions on child objects’ then click ‘Ok’ and ‘Yes’ on the security window and then ‘Apply’.
Now add ‘Everyone’ and give ‘read’ permission, then click on advanced and click on the ‘Replace permissions on all child objects’ again and click ‘Ok’ and ‘Yes’ at the security window and then ‘Ok’.
Repeat this for all the 3 keys.
right click the key select permissions, select everyone and remove before clicking apply select the Advanced button and click the Replace permissions on all child objects, click Ok then Yes on the security window then Apply. Now Add everyone and click on Read then Advance button and click the Replace permissions on all child objects, click Ok then Yes on the security window then Ok. Now repeat on the next 2 keys. (By clicking Read then Advanced it selects a few other permissions so please do it this way)
#6 Log in with a ‘normal’ user and Internet Explorer should as it should again!