Do you get a lunch break ? How about taking a short 15-30 minute walk at lunch. If you drive to work, park at the far end of the lot and walk the extra distance. if you use an elevator, get off one or two floors before your office and walk up the stairs. If you take a bus or subway, get off one or two stops before and walk the extra way. These are simple things you can do to make your day more active.
Coach Nicole does have a short 15 minute desk workout. www.sparkpeople.com/resource/videos-detail
Personally, I don't believe people should be doing exercises at their desk even if they have the best of intentions. If your boss were to see you doing exercises instead of your work, they might assume you don't have enough work to do or you're not doing your work in favor of the exercise.
One thing you might consider is working out at home while you're watching TV. You can do strength training exercises with resistance bands while watching your favorite show. Unless you have an injury, the two pound weights won't do a lot. Women are a lot stronger than they think. How heavy should the weight be ? Weigh your handbag or the every day bag you carry with your stuff in it i.e. license, money, makeup, etc. If that bag weighs 8 pounds, that's the weight you use.