I have a 5 Year old Lenovo Desktop 4GB RAM with Windows 7 and both the PC and the operating system has served me very well and no issues. I do not use it that often maybe once a week when I need to be really productive and look at giant monitor and want to type on an actual keyboard. I don't do any gaming but to just surf the internet and a little photoshop and MS Office stuff.
I do notice that it is lagging a little bit and keep getting nagged from my taskbar about a free upgrade to Windows 10. Any consensus from SDers whether to upgrade or not or will it just be a waste of time and give me problems afterwards?