I have a Freecom DVB-T Art No: 25452
I know the revision 4 of this device runs a Realtek chipset, but I think this one has a different one but a Google search gives me conflicting information
Its VID is 14aa and PID is 022a
closed as too localized by DragonLord, slhck♦, KronoS, Nifle, Ƭᴇcʜιᴇ007 Jul 14 '12 at 23:24
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From here (waaay down page) it looks like it's based on the ZL353 chipset, natively supported in the linux kernel. (but you're not using linux)
Have you tried going to the manufacturer's website for drivers?
Going to the freecom.com website, product support, downloads & faq's..., several drivers available, one matching your given article 25452 for vista, which should work with Windows 7. Direct Link to driver download.
To recap, since the answer above might be lost in the noise:
Chipset is ZL353.