I noticed posts by a robot or a rogue program with a membership name related to a malware advertising srver known as "163 dot com". It can be sticky and recurs after removal. If you suspect you have this in your system download a program called Malwarebytes' Antimalware, install it then update it. Now do a scan to detect and then remove any malware found.
If it asks you to restart to finish the removal it's OK. You need to repeat this 3 times every about three days in between to be sure it's gone. Then use a good anti virus (something other than Norton's or McAffee's). Good luck.