I suggest you perform a full system scan with your AV. and as MsM said it might be Redlof.A. it inserts a small script code into the folder.htt file. deleting the file wouldn't help it will infect all your folder.htt file . and i been hearing lately that Virus has been found and spreading in many computer in the Indian Sub-Continent. Almost all of my School friends including me had a recent infectin with this virus