Infected File not detected…

I am having a problem with my windows o/s. there are files Folder.htt and desktop.ini automatically replaced with my original files and creating a problem while browsing my computer contents. these files slow my system speed while browsing the files. showing message in the status bar that ” can’t load or initialize ActiveX components.” when I delete these files my system works properly but when I reboot my system it again creates these files. . this is I think a virus commonly moving over the internet. my other friend also facing the same problem. Please help me out with this problem.