Blocking ads in ooVoo is a relatively simple process. There's a few steps involved, but there's nothing too complex.

How to block ads in ooVoo

1) Edit hosts files

a) Click Start. Enter 'Notepad' in the search.
b) Vista/7: Right-click on the Notepad icon and select 'Run As Administrator'.
Other: Click the icon to 'Open'.
c) In Notepad, click 'File', 'Open' and navigate to 'C:\windows\system32\drivers\etc'.
d) Change the file-type to 'All Files (*.*)'. Select the 'hosts' file and and click 'Open'.
e) Add the following lines to the bottom of the document:

 127.0.0.1 ds.serving-sys.com
 127.0.0.1 googlesyndication.com
 127.0.0.1 img-cdn.mediaplex.com

The above entries block anything coming from those website domains. So basically, we are just creating a list of all the places ooVoo gets it's ads from, and blocking them.

If you discover a new place ooVoo is getting ads from, you can simply add it to the list. Alternatively you could use a comprehensive list of ad servers, such as the one found here.

Note: changes to the hosts file are system-wide. So changes you make affect any application that accesses the web, not just ooVoo.

2) Flush DNS cache

a) Click Start. Enter 'Cmd' in the search.
b) Click the icon to 'Open'.
c) Type the following: ipconfig /flushdns
Windows will report the cache was successfully flushed.

3) Restart DNS Service

a) Click Start. Enter 'services.msc' in the search.
b) Click the icon to 'Open'.
c) Navigate to 'DNS Cache' in the list and right-click.
d) Select 'Restart'.

4) Restart ooVoo.

a) ooVoo ads should now be replaced with a blank white box.

How to find where an ooVoo ad is from

The ad will be one of the following two types. Identifying the source address is slightly different for each.

a) HTML based - Right-click on the ad, there will be a 'Properties' option. Select it and take note of the Address (URL).

b) Flash based - Right-click the ad, there will be a 'Settings' option. Select it and take note of the Address (URL) on the privacy tab.