can’t delete dll or xml file in program files folder?

Alright, so i have firefox, and in the plugin folders I cant delete a dll file (the adobe reader plugin). I cant replace it either…

When i try it says blah blah "make sure disk isn't full or write protected" blah blah

And another, I found a firefox beta 3 folder in program files as well - and of course i tried to delete it. But it wouldnt delete a file called blocklist.xml something or other.

Anyways, this whole problem started because my FF3 can't seem to open up pdf files using adobe reader when I click a link online that is a pdf. I am using reader 8.0, and the plugins are all there…what could be the problem?

I just think its a little bs that I cant delete some junky files in my program files folder, those that which should be under my complete control. I mean…sure system files that is ok but why something so stupid as a 1KB size xml file that i can read in notepad?

Yeah, please help if you can
Thanks in advance

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