I don't use IE8, but according to this site,
Internet Explorer 8: IE has the Flash block functionality built-in so you don’t need to install any additional plugins to be able to block flash on IE 8.
Also remember, Flash does not pay on 64-bit IE 8 so you won’t be able to perform the following steps on a 64-bit IE 8, they work well on 32-bit IE 8.
- Click on “Tools” and “Manage Add-ons”
- Click on the dropdown under show and select “All Add-ons”
- Click on “Shockwave Flash Object” and then click on “More Information”
- Click on “Remove All Sites” button to remove * sign from the approved list of sites
and click “Close”.
Now whenever you visit a site which flash on the page, you will see a message on top of the browser asking your approval to run the flash plugin. The approved sites will go to the approved list of sites which is nothing but a whitelist of sites.
That is different from your install adobe problem.
In your case, no sites will be approved.
Does that help?
I think with some more tricks, this can be stopped too.
What I am not too happy with here is, you probably end up installing flash and then blocking it... :-(