You will have trademark issues with the "Windows7" name, try and stay away from names like this that infringe on trademarks (Microsoft are very aggressive in protecting their TM) Example - domainnamewire.com/2010/10/11/microsoft-files-cybersquatting-lawsuit-over-bing-domain-names
3dtv-review.org - This is not worth anything, firstly, try and stay away from .org names and hyphens when starting out, these are 2 things that destroy this name. Try and stick to .com/net in the beginning until you get a feel of what makes a domain valuable
Read through this for a few weeks/months before regging anymore names