Note that many websites have their own advertising, unrelated to adware.
Roimoi is a randomly-named adware .exe, and downloader ActiveX object, controlled by roings.com.
Roimoi is closely related to Roings's SearchSprint toolbar, which is often bundled with it. Other parasites Roimoi has been seen to install include Wink/EasyDates, InternetOptimizer/Active, ISTbar/XXXToolbar, DownloadPlus/PowerScan, nCase, SaveNow/Search, ShopAtHomeSelect and Webhancer.
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Some variants may include a 'Media Motor' entry in the Control Panel's Add/Remove Programs list. Using this, then deleting the Downloaded Program Files entry (see below) should remove the software. (Though you should also check for SearchSprint and other adware that it might have installed.
Open the registry (click 'Start', choose 'Run', enter 'regedit') and find the key 'HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run'. There should be an entry inside this key with a randomly-generated-nonsense name, pointing to a .exe file with a different randonly-generated-nonsense name in the Windows folder. Delete this key.
Restart the computer, open the Windows folder and delete the .exe file with the name seen in the registry. You can also delete usta32.inf or usta32a.inf in this folder if you have it.
Next, open the Downloaded Program Files folder and remove the entry with the name "Project1.UserControl1", "ddm_download.ddm_control", "jimmyloader.jimmyform", "jimmyload.jimmycont", "limmyloader.limmyform" or "IObjSafety.DemoCtl"