Sorry. This may not go down well, but if I hear questions like "I've always had trouble downloading ISO files", "How do I extract ISO files", "I'm a complete noob", "Where do I find xyz", I would not be recommending Linux for a number of reasons:
* If you're having trouble with Windows 7, you're going to have the same or more with Linux. I don't know what your troubles are, ie drivers, crashes, software compatibilities. But you'll definitely be having some issues.
* Based on the way you asked your question, not sure if you're aware that you won't be able to run most of the software you're familiar with on Linux. Yes, you can use Wine or some other Windows emulator, and yes they've improved a lot, but it's just one more layer of complexity for a self-admitted noob.
* If you're into astro, there just isn't the same amount of astro-software available.
Don't get me wrong, I run linux servers at home and at work. Use them on a daily basis. I'm not a MS-fanboi, but nor am I a Linux-fanboi. Just think it's horses for courses and not sure if Linux is the right answer for the OP. I reckon he should persevere with Win7 and try to get that working.
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