Hi,
Most likely the problem is you haven't reference the EMGU.CV, Emgu.CV.UI and EMGU.Util files again. When you open the project look in the 'Solution Explorer' panel. Expaqnd the folder References. You should have three references for EMGU.CV, Emgu.CV.UI and EMGU.Util these may have yellow error symbols next to them or if you have tried this already not. The key is you must delete the references. Making note of there names if there are more then these two.
The Right click on the References folder and select "Add Reference" you will have to wait for windows to build the references up depending on your machine. In the tabs at the top of the Add References window select Browse.
Locate the folder where you installed EMGU (I keep the folder in my Visual Studio 2008 folder for ease since you have to do this for every project you make) in the 'bin' folder locate the references EMGU.CV.dll, Emgu.CV.UI.dll and EMGU.Util.dll and add them
This should solve your problem
Cheers
Chris