Thats just a tracking cookie, you can follow these tips.
The following are the most likely reasons why your computer got populated with rightmedia.com cookie:
* You have directly visited rightmedia.com
* A website that you have visited uses some of the components (pages, files, images, and so on) of the rightmedia.com website
* A software application with Internet-enabled functionality that had previously accessed the rightmedia.com website was running on your PC (in this case, the rightmedia.com cookie will be saved in Internet Explorer)
Detecting rightmedia.com Cookie
Internet Explorer
1. From the Tools menu, or the Tools list in the upper right section, select Internet Options
2. Under Browsing History, click Settings
3. Click View Objects or View Files
4. Check if for the rightmedia.com cookie is present on the list
To detect rightmedia.com cookie in Mozilla Firefox (FF)
1. From the Tools menu, select Options
2. In the upper section of the Options window, click Privacy
3. In the Cookies tab, click Show Cookies
4. In the Cookies window, enter rightmedia.com in the Search field and run a search, or you can scroll down the list to check whether the rightmedia.com cookie is present there
Permanent Blocking of rightmedia.com Cookie on Your PC
To block rightmedia.com cookie in Internet Explorer
1. From the Tools menu of Internet Explorer, select Internet Options
2. Select the Privacy tab, and then click Sites. The Per site privacy actions window will be displayed
3. In the Per site privacy actions window, enter rightmedia.com in the Address of Web site field
4. Click Block
To block rightmedia.com cookie in Mozilla Firefox
1. From the Tools menu, select Options
2. In the upper section of the Options window, click Privacy
3. In the Cookies tab, click Exceptions
4. In the new Exceptions - Cookies window, enter rightmedia.com in the Address of Website field and click Disable
Let me know if this helped