Why is my computer suddenly running slow?

Lenovo Ideapad y510p
Specs:
i7 with 2.4 ghz
1 TB HDD
Nvidia Gforce gtx 750
About a year and a half old

I left for a trip during the holidays and took my laptop which is usually hooked up to a monitor for a dual monitor display. Programs normally run great and games like Skyrim (somewhat intensive) can run on high settings. However, I unplugged my HDMI from my other monitor and upon bootup when I had reached my destination, I discovered that the laptop was running differently. Everything was greatly zoomed in (which doesn't bother me) and programs ran slow (which greatly bothers me). I tried playing normal DVDs in my ROM and they would randomly freeze up and the media player would become unresponsive. The default screensaver (video that activates upon an idle time of one minute) that Lenovo gave me now gets very pixelated and unclear. I tried to run Skyrim just as a test and it is beyond laggy.
The problem may fix itself when I replug my computer into the other monitor in a few days and the whole system runs as it normally does.
I also upgraded to Windows 10 recently and that may be the problem. If this persists I will just restore my laptop to factory settings back to 8.1 on which everything always worked.
Any comments, ideas, or suggestions? I really don't want to have to rest the entire laptop as doing so would be a huge pain.

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Ultra bay graphic card help! Lenovo gaming?

Ultra bay graphic card help! Lenovo gaming?

Added (1). ey guys I want help to find a good graphic card for my lenovo Y510p laptop. I want to play the game called Star Citizen and as of now my computer can't. The minimum requirements for the graphic card is:
NVidia Geforce 460GTX AMD Radeon HD5850 DirectX 11
My graphic card is the:
Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
My laptop comes with an Ultra bay, and I want to switch it out for a good card. What should I buy? I don't want to spend a lot of money, but any information helps!

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Good gaming laptop for hopefully less than or not much more than $1000?

So I've been looking to get my first gaming laptop for a while now and starting from knowing almost nothing, I think I've learned quite a bit on what to look for but as I get closer to making the final purchase, I'm still a bit indecisive. Here's a couple I've got in mind:

ASUS ROG GL551JW-WH71(WX): http://store.asus.com/us/item/201510AM150007425/A17602
MSI GE Series GE72 Apache-235: http://www.newegg.com/...6834152902
Lenovo Y50-70 59440654: http://shop.lenovo.com/...s6&irgwc=1

So from what I've found so far, an Intel i7 CPU is good, NVIDIA GeForce 960M is adequate for mid to high settings (I'm not entirely sure how much it would cost to improve this), and that most gaming computers in this price range have 8 GB of RAM but I'm still a bit confused about the HDD and SSD. Are these computers I listed going to be able to play most high-end games on at least decent settings for hopefully a couple years and if not, are there computers that will be able to by spending only a couple hundred more dollars to upgrade specs like GPU or the HDD/SSD?
(Also sorry that I can't really give specific games because I haven't played any of them yet but I'd like to get into gaming and at least have the option to play some of the more demanding ones if I want)
Any sort of help, recommendations, or redirection would be greatly appreciated.

Murph 4 answers