Performance speed-up

Hello Kathy,
We regret for the inconvenience caused. To assist better, could you please confirm whether you are getting error messages at the time of booting of your computer or after system boot up? Thank you.

I got a pop-up offering to improve my computer's performance.  I allowed it to delete some registry items, and now, I'm getting error messages every time I boot up…this problem had not occurred before this scan.  Here is the message I'm getting…"The ordinal 840 could not be located in the dynamic link library iertutil.dll.  Over the top of the window, it says "wruninstall.exe ordinal not found"  There is another similar message I didn't copy…any way to replace these files?

Hello Kathy,
We regret for the inconvenience caused. To assist better, could you please confirm whether you are getting error messages at the time of booting of your computer or after system boot up? Thank you.