Symbols appearing in every file of my computer, coming from Norton 360, I want to suppress them

After doing I do not what (I suppose to my Norton 360), every single file symbol (for Word, Excel, PPT), has a small square symbol in the lower left side. Some have a white V like symbol on green. Others have two white >> on blue. I would like to know what do they mean and how to get rid of them. Looking to images, they occupy near 1/4 of the area when showing large icons. Thank you very much for any help you could give m.

After doing I do not what (I suppose to my Norton 360), every single file symbol (for Word, Excel, PPT), has a small square symbol in the lower left side. Some have a white V like symbol on green. Others have two white >> on blue. I would like to know what do they mean and how to get rid of them. Looking to images, they occupy near 1/4 of the area when showing large icons. Thank you very much for any help you could give m.

Dear Sir/Mme. Thank you very much. It worked perfectly. It was of a great help for a beguinner like me. Regards. ggmadrid