Note that many websites have their own advertising, unrelated to adware.
DownloadPlus is a process run at Windows startup which opens pop-up adverts (many of them porn-related) and, for some reason, weather reports.
The software also refers to itself as MessageCenter internally.
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Can silently download and execute arbitrary unsigned code from its controlling server, as a self-updating feature.
One comment inside the program claims copyright by "PornKing".
Click Start and open the Programs menu. Open the Startup submenu, right-click 'Download Plus' and choose 'Delete'.
Restart the computer and you should be able to delete DownloadPlus.exe which can be found in the Application Data folder. (On Windows 95/98/Me, the Application Data folder can be found inside the Windows folder; on Windows NT it is inside your user 'Profiles' folder in the Windows folder; on Windows 2000 and XP it is inside your user Documents and Settings folder.)
If you have the MCInst loader, open Downloaded Program Files (which is in the Windows folder), right-click 'Loader class' and choose 'Remove'.