IE degrading text graphics

Well I have been working on a template purchased by a client and have a graphic with text in it. I used Arial as the font since it is simple and clean but have noticed that IE7 makes it look bad while in Firefox it looks clean and sharp. Is there any way to clean it up more for IE? I did notice that the Sitepoint logo has the same look - not so good in IE7 but nice and clean in Firefox. Not sure what Firefox is doing in the background to make text images so nice compared to IE but maybe MS needs to look behind the scenes of Firefox and follow their standards.