if you had played with, or attempted to play with those little USB TV dongles, e.g. the black dongle that Andrew VK3BQ sent as link for on ebay end of last year. The black rtl2838 based dongle is more sensitive and less prone to image signals than the white rtl2832 based dongle we had used in the past.
I can advise that the SDR# (sdrSharp) website have greatly improved their download and install package and install procedures, it's now a much easier task. And the rtlsdr.org site have also improved their install procedures instructions, for those using RTL based dongles.
The latest Zadig USB driver installer is much improved too. Note: two versions of Zadig, one for XP and another version for Vista,Win7 & Win8.
begin here at the SDR# downloads area:
which includes links to install procedures on rtlsdr.org for MS Windows and Linux
Somehow I broke my SDR# installation on my notebook last year whilst trying to update it and could not get it running properly, but I did the download and reinstall yesterday and now it all works great, I can even swap between dongles to compare them, both dongles work fine. Really pleased with it now.