Is your website easy to read? The best practice for website readability, according to www.Webaim.org, is to use fonts with styles of letters that are "friendly."
"Verdana is one of the most popular of the fonts designed for on-screen viewing. It has a simple, straightforward design, and the characters are not easily confused. For example, the upper-case "I" and the lower-case "L" have unique shapes, unlike Arial, in which the two letters may be easily confused."
Go over all of the copy on your website and take our recommendation - use Verdana as your font of choice to make your website more readable.