Deskbar.GiantExplorer is typical of spyware programs—it embeds itself into Internet Explorer as a toolbar.  It is able to do this because it is a BHO, or browser helper object.  Browser helper objects are not detected by firewalls, which is why they are able to easily infiltrate a computer.  This malware will try to direct you to their third-party sites and will inundate your computer with unwanted pop-up advertisements.

Your best solution to this annoyance is to remove it with SpyZooka.  SpyZooka is a trusted anti-spyware program that is also backed by a guarantee that few can argue with – 100% spyware removal or your money back.  There are not very many companies who can say that.