spybot antibeacon. Windows 10 with all the tracking crap turned off. It does sadly* break the use of bing too.
*lol
Handy. I'll be using that just in case the tracking somehow slipped past me and was installed on my PC. I'm also still running Win 7 because even when it was "free" Win 10 was far too expensive for me. I'm not fond of being a product. Besides, I like to have a PC that I can be fairly sure will work all the time and not just when MS haven't broken it and I like to be able to choose what's on my PC and who can use it. My next upgrade will be purely a games console even if it is a PC. I'll use Linux for my general purpose PC, since Win 10 is inherently unreliable and insecure to a degree I'm not willing to use for anything other than gaming.
I've tried to send Spybot a donation but Verified by Visa failed to work and returned the highly "useful" error message 20028. There are...issues...with even a moderately secure computer and the net and some of them are even more inconvenient than not being able to use the world's best and most loved search engine, despite how super wonderful a thing Bing is.
Tried again and got endless "processing". Oh well. I fed it my card details both times. Maybe it'll send them both donations
EDIT: To answer the OP's question and considering that their friend might well have use for a fairly meaty CPU given that they're working with video and photography, I'd suggest considering an i7-4790K and a suitable 1150 motherboard. They're still available second hand, the price is reasonable and they're not
very far behind the current high end CPUs in terms of performance. Certainly should be enough grunt to do the job well. I'm using an i7-4790K on a Gigabyte Z97-D3H board and that would fit the OP's request very well IMO. You could probably get an i7-4790K, decent board and 16GB of decent memory for it for £300. I'm not sure you could get 64GB in it, though. I could be wrong, but I think you'd be limited to 32GB as 4x8GB on socket 1150 boards.