How to restore app that was paid for and now has ads

i have uninstalled apps i paid for and in the future reinstalled apps and have ads

Where did you re-install the app from.   Not, I hope, Softonic, CNet or the like?
If you have ad malware, read these documents.  Both from highly respected members.
http://www.thesafemac.com/admedic/
https://discussions.apple.com/docs/DOC-2435

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