Note that many websites have their own advertising, unrelated to adware.
Apart from the hijacking and added links, the software will show pop-under advertisements when its controlling servers direct it to.
Xupiter consists of an Internet Explorer toolbar containing link buttons to the search engine at xupiter.com and a task run at Windows startup which downloads updates to the software and may launch pop-ups. It also contains functionality to periodically hijack your home page and search settings to point to xupiter.com, and add links pointing to xupiter.com to your bookmarks.
Open the registry (from the Start menu, click Run and enter regedit) and find the key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run. Delete the 'XupiterStartup' entry.
regsvr32 /u "C:\Program Files\Xupiter\Updates\XupiterToolbar.dll"
regsvr32 /u "C:\Program Files\Xupiter\Updates\XTUpdate.dll"