Windows7
You are joking, are you?
Windows7 is just the worst OS you could name for the task recording weather station data on low power consumption machines we´re talking about here.
With its heavy graphical interface it is not running on these platforms at all.
No, Linux is far better than anything from Redmond, not at least because it´s Open Source.
And the Linux scripting tools beat everything MS has ever tried to copy from Thorvald´s OS.
If you want to go with Windows, there´s already a solution for it:
http://www.pc-wetterstation.de/enindex.html
So, buy an Atom driven low power consumption gadget with enough RAM like the FIT2-PC (=very expensive!!) and you will be satisfied!
Werner Krenn´s software is excellent, no doubt. And even I´m using it for exporting my long term data and let it create all the nice graphs.
But meteohub has also a lot of advantages from its Linux approach, allowing to extent it with all the smart shell scripting and other tools already there.