Blog comments that simply says, click here or visit here and similar variants are very dangerous, if I may warn blog readers. Clicking on those links sometimes lead you to pages that automatically initiates downloads. Those downloads are viruses that slows your PC and disables its ability to finish a scan and cleanup.
Install anti virus and anti spyware programs and if possible have them automatically scan anything that tries to sneak into your system. At this point, Kapersky is well known for that. I also heard that Faronics Deep Freeze is also very good. It allows downloads but deletes all of it when you reboot your PC.
Search for reviews before buying one. There are also free versions of good programs like Kapersky. I recommend that you try it out before choosing the program that suits you best.