System Date Errors

Yesterday I was checking a date a month ahead and somehow I changed my system date. When I went to change it back I got this error:

Your system clock appears to have been set back, possibly in an attempt to defeat the security system on this program. Please correct the system clock before trying to run this program again. If your clock is correct, please contact the author of this program for instructions on correcting this error (report code CCB-F)

Now about every two minutes I get a pop up with this message interrupting everything. How do I get it to stop? Thank you.