The free upgrade period has expired (July 29th) for general public.
(yes, I am aware temporary
loopholes exist to upgrade using valid windows 7/8 keys and for those people who use
assistive technologies)
This however, is not a "Free" operating system, this is just the "free" upgrade
To suggest using Cracked Software/OS is terrible advice, moral and legal issues aside, what sane individual would connect their computers to their financial institution(s) with pirated software?
(and yes I anticipate your reply being, that after installing crack Win7, performing Win10 upgrade, you re-format and fresh install Win 10, doesn't mitigate bad advice)
If a pirate will steal for you, he will steal from you...
I usually don't respond to these one-post wonders... but can't help but respond to bad and illegal advice.
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Regarding SSD 250gb vs 100gb, the cost has decreased dramatically that it does make sense to go with 250gb/500gb drives if only to future proof... I agree 100gb would be sufficient for an order entry / charting system only... but for < $50, why limit yourself...
Assuming the OP is not just another spam, view/post generator -- considering the lack of any technical expertise at all, multiple drive, home built system isn't the best option in this case.
I am an advocate for self builds, but in this case Dell outlet refurb and install dedicated video card is more appropriate... (or as Scat would suggest, eBay used system)