Error message in LR5

i have already uninstalled and re-installed ACC, PS CC and LR5 and am still getting the message "An error occured when attempting to change modules" when opening up LR5. i cant do anything in LR5. any suggestions?

nikonjedimaster, Did you had Lightroom 4 installed on this machine before installing Lightroom 5 and Did you try to upgrade your catalog from Lightroom 4 to Lightroom 5?
Lets reset Lightroom(LR) preferences and then check. http://help.adobe.com/en_US/lightroom/using/WS82DA0B67-FA83-4c71-84B9-6F248A97FBE8.html
In case of same issue, create a new Catalog and launch Lightroom:
Quit Lightroom(not sure if you are able to open it at all after that error).
Press Option(Mac) or Alt(Win) and Launch LR5, you will get the recent catalog list.
If you see any other LR5 catalog, select it and click Open.
Else, click on "Create a New Catalog". Type the catalog name and click on Create.
It will launch your LR5.
Check if your LR works fine now or you still get any error message.
If that works then, its an issue with your catalog.
This article will tell you, how to combine catalogs or move photos from one catalog to another. http://helpx.adobe.com/lightroom/kb/catalog-faq-lightroom.html
Hope that helps.

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