I suggest if you upgrade that you do a clean install...I've had problems with a couple machines just upgrading the system. (keeping the old win 7-8 files has led to microsoft account issues, so wiping the entire drive and doing fresh install worked best)
And like angry monster suggested, wiping out the old windows files will clear your hard disk up nicely if you go the upgrade route (it's worked for some folks, so you may be lucky).
but once it's all said and done, Windows 10 is perfectly fine and I'm quite sure you'll love it...the EDGE browser sort of sucks balls still as there's no real ADblocker for it yet, Stick to google chrome or firefox, even opera is a sight better than edge for some applications.
if you use an HDTV for your monitor, you'll need to check the device settings to make sure the volume works fine as I've had minor issues that were easily fixed using the troubleshooter included. ( i reset my HDMI as the primary sound device and it worked perfectly after)
if you install using a burnt DVD, it'll go much faster than the downloaded version by at least an hour or two (I've averaged about 2 hours from disk-in to final reboot)
...and don't forget to install antivirus immediately.
well, before you download and install League. You'll love having that as the first program on the drive head...the access/read speed on my HD is 7900rpm's and the transfer rate at the front of my drives gets read at 52mb/s - 92mb/s which is really good.
another tip, don't use an SSD for the system files, keep that for your games and programs specifically as you don't wanna wear out the drive.
other than those suggestions, I wish you luck. (make sure you remember to open task manager once you've tried playing with it and turn off the apps you're not using...it keeps them in memory otherwise)
