Application Error

I've read the few threads I could find titled Application error and will apologize if my solution was in one of them, I did not find what I was looking for. I have an Acer laptop and recently my brother somehow installed System Security onto my laptop. We were able to remove it but now whenever you log on it displays an Application Error. I'm afraid it's going to mess up my computer and would appreciate any help in fixing it. The error states. "Exception EIncorrectUDB in module 872748237.exe at 000A6635. The file is not a database."

 

Well. I did install the recommended link. But..seeing as I don't possess a bank account or a credit card I can't purchase the program to 'fix' what it is telling me needs fixing. Thank you for trying anyway.

 

Thank you. I clicked the link you provided the first time. And it took me to a page that displayed in the top left corner a price for the program. I downloaded the recommened link before replying back to you the first time and the program informed me the free version would only fix the first six percent and that I needed to pay for the full program to get rid of the rest. However. I've restarted twice since then and the error did not pop up the second time. So perhaps it has been fixed inadvertantly. Thank you again.

 

That is not the same link or place I was taken before. Another thing though. A friend had recommended that to me so I had already downloaded it to my computer before ever joining this forum. It cleared my virus..but that is when the Application error began popping up and the Malware thing was running a clean bill whenever I scanned my computer. So then I joined this forum and downloaded something from your first link and after restarting twice the error message didn't pop back up.