Every once in a while i see someone asking for help with Windows Installation media, so here's a little guide for the oblivious. I'm not gonna link you to any torrents, rather tell you a legit way to download it. Yes that means you can officially download legit Windows ISOs from Mircosoft and use it (you'll need your method of activation though, whatever that may be).
Windows 7 SP1:
First I'd like to credit , as i learnt this from him.
You simply need to click on one the following links and the download will begin:
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These are all official Microsoft Windows ISOs hosted on Microsoft's DigitalRiver server. Just download and install, they're completely safe!
This one's my own finding (ramdom search sprees).
Who would've thought you could download the latest (current) OS from MS themselves, but you can! You don't even need MSDN subscription or anything like that!
So, first you need to download a small utility from MS here.
Then run that file, it is basically a download customization tool that lets you choose which language/version/architecture of Windows 8.1 you want to download. Once you've chosen, it will download your selected ISO from Microsoft's servers and you can use it.
Unfortunately unlike Windows 7 links, you cannot download these with download accelerators, so you're gonna have to settle with the utility's download speed. Also, it takes additional time after download finishes for some verification tasks. In the end, you get the real thing though.
So there goes, legit Windows 8.1 right from Microsoft!
Hope you guys found this useful. Take care & keep sharing the goodies!