Windows 8.1 PC running very slowly?

So my computer was running very very slowly (so much that you can't go to start menu or open anything). Starting up is also very slowly, takes up to 8-15 minutes. And then after logging in it takes another five minutes. I recently upgraded to Windows 10 and but I didn't really like it so I upgraded it back to Windows 8.1 and it became very slow. The cursor works fine (not a slow cursor). CTRL+ALT+DELETE takes up to 20 seconds to load. To click a something (desktop icon, start, etc etc), it takes a very long time like 10 to 20 minutes. My PC is a 64 BIT, Lenovo, Windows 8.1, and its about one and a half years old. Before I upgraded to Windows 10 it was working fine but after I changed back to Windows 8.1 it suddenly was very very slow.

Please reply soon, thanks.

New laptop has better gpu than desktop but performs horribly?

I just bought the lenovo y40-80 the 1400 dollar one and it has 4 gb of vram, it has an r9 275x. It also has a dual core Intel core i7 5500U.
My desktop has an amd a10 5800k overclocked to 4.9 ghz (quad core) and my gpu in my desktop is an r7 260 by power color and has 2gb of vram. Why do I get half the fps I get on my desktop on my laptop?

Are refurbished Lenovo computers any good?

Just wondering if you think this is a good deal… It is a refurb with factory warranty until 8/16 and asking is $800

Lenovo K450e Desktop, i7-4790,3.6GHz,32GB,2TB, GeForce GTX 750, DVD, Win 8.1

I upgraded my Lenovo ThinkCentre Edge to Windows 10 and now I get an error message?

The error message reads:

"The current Dolby audio driver is 7.2.8000.13 and the software application expects driver version 7.2.7000.11. Please install a valid driver and software application combination."

Is there a fix for this Windows 10 problem yet?

Is this a good computer for moderate gaming and everyday use? Like League Of Legends on 60 fps?

I'm not planning to play high end games but do you think this computer can run The Division or should I upgrade the Graphics card?

Added (1). http://www.bestbuy.com/...Id=7124026

Can I upgrade the graphics card in my All in one PC?

I've been looking at getting GTX 750 ti graphics card and I was wondering if it would be compatible with my computer and how would I do it

My computer is: http://www.currys.co.uk/...html#packs

How to connect a ps4 to an All IN ONE Desktop? - 1

I bought an Lenovo (SN: P90061SZ) which has an hdmi in & out port at the back. I'm trying to connect my PS4 to it because of it's 1080p High quality. So, do I put the hdmi cable on out or in? Also, how do I go to the hdmi screen because this model doesn't have a button for me to do that?

How to connect a PS4 to an All In One Desktop?

I bought the Lenovo and it has a HDMI IN PORT at the back, but no button for me to change the mode from pc to hdmi like a laptop does.

Computer Won't Start Up

We just bought a Lenovo k450e i5 desktop and just started using it yesterday night. First time we started it up wondows 8 loaded, set up the pc, could browse the internet and everything worked. This morning i tried getting on and it boots up, loads the black screen with Lenovo on it, disappears and freezes and just a blank blue screen. I've tried shift and f8 and it won't even load safe mode. Pc is brand new, Help!

Why didn't windows 10 work? And do the windows 7 drivers work in windows 10 without any issue?

So I tried the free windows 10 upgrade a few days ago, the installation took a little longer than it should be, but it eventually got through.

The problem started when it booted to the desktop, the screen was at the wrong resolution and there was no other selectable option in the setting to correct it, then the system would freeze at several minutes intervals, also application icons would just disappear from the taskbar and lastly, the start menu itself would not work, it wouldn't even come up(it did when windows just booted)

Basic system info; Lenovo V570, 64bit, Intel core i5 @2.40GHz with 6GB RAM.