restoring my computers DNS settings

Hi! ;D

I’m having sporadic problems with internet connectivity since I installed Comodo. Wonder if may be to do with DNS settings?? When I installed Comodo I agreed to use their suggested DNS settings, but now I would like to try restoring my computers original settings, to see if this helps the problem, however I don’t know how to do this! Please can anyone help by providing instructions for how to do this? Also, how to change again to the Comodo suggested DNS if I want to go back to it in future.

As you can probably tell, i’m not an advanced pc user! :-\

Many thanks!

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