Note that many websites have their own advertising, unrelated to adware.
From the Website:
KaoTan is a webdownloader made to suit users' needs. Here are its features : - You can download up to 2 files - 3 directories where the downloaded files can be saved : a. Windows b. Temp c. System - Injection modes : a. No injection ( standard connection ) b. Browser injection c. Explorer injection d. Trillian/MSN injection - You can set up a timer, thus delaying the execution : a. Off b. 30 seconds c. 1 minute d. 5 minutes - The server can melt, once ran - Critical data such as the URL to the file to download, or the names of the .exe, are encrypted'