How do I uninstall and then reinstall Lightroom 4?

My Lightroom 4 is acting up (edit options grayed out...it wonʻt let me delete photos...itʻs saying photos are missing when I havenʻt renamed or relocated them, etc.).  So I want to UNinstall, then REinstall it to see if that helps.  I ordered LR online and have my serial number.  If I uninstall LR and then reinstall it again will LR think that Iʻm installing it on another computer?  Iʻve had programs and computers crash in the past and Adobe thinks that Iʻm reinstalling on multiple computers, rather than just reinstalling it on the same computer.  Does anyone have some insight? 

Tell us more about your OS, etc... It maybe that you don't need to reistall, etc at all.
First try removing the preference file found here:
http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroom-41.html

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