Reader - can't open PDF's  says needs plug in

I have the most updated Reader for a Windows PC running XP / IE8  . For some reason I can no longer open PDF files in Reader...occaisionally it will say it needs a plug in.  I tried removing Reader from Add/Remove and it won't let me do that, nor will it let me change it.  I tried doing another download, hoping it would overwrite the last one.....won't allow that either it says I already have the current version but it won't work  so what now.  Do I have to buy someones program to fix the supposedly free Reader???  Help if you can

G in Utah wrote:
I tried removing Reader from Add/Remove and it won't let me do that, nor will it let me change it.
How does it "not let you" - do you get an error message?
Try removing the corrupted Reader installation using http://support.microsoft.com/mats/Program_Install_and_Uninstall
Then download the installer from http://get.adobe.com/reader/enterprise/ and install it from scratch.

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