Computer Speed/ Audio & Graphics

Hello,
My computer has gotten really slow as of recent and I cannot diagnose why. Any streaming videos begin to pause on and off and the graphics are in turn rarely in time with the audio. However, I think my computer is being slow elsewhere in a general manner. I’m no computer expert, but I’ve cleaned my browser caches manually. I’ve used MacKepper FastCleanup as well, eliminating some more caches and some binaries. I’ve also cleared out a lot of clutter on my desktop because I heard that takes up processing space. And while streaming videos (even a DVD in my drive) I keep the computer next to a fan in case it is heat that causes the issue. I’m not sure what else to do.
Also, this may be unrelated, but a month earlier the audio kept dropping out consistently in all mediums (iTunes, youtube, netflix, etc.) I could have it set at a volume, but then the icon would go grey rather than black and there would be a "Universal No” symbol over the icon. Also, as a result of the audio going on and off, the video would just stop. It got to the point where I could not watch anything. As of lately, the volume adjustment has only been really slow to readjust after I’ve pressed the increase/decrease buttons.

Melophage, I was also verifying my disk permissions as suggested by Mac-world (http://http://www.macworld.com/article/1052220/repairpermissions.html), and it did indeed pick up a corruption in the volume Macintosh Volume HD. I don't know what this is, but a window popped up and explained the necessary steps to repairing it as seen in the image attached.
I followed these instructions, pressing on Command and R simultaneously, but another window pops up (image is below) rather than the apple logo as promised. If I try to continue the origninal instructions, my computer just blurts the incorret keyboard sound until I lift my fingers. The image is attached below.
I'm not sure what to do. Any thoughts? Thanks

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https://forum-en.msi.com/index.php?topic=253215.0

Quote from: CalcMasterH on 15-February-15, 11:45:39
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Quote from: CalcMasterH on 15-February-15, 11:45:39
Don't know if this is the right place to post this, but I'm pretty sure it has to do with the graphics card.
So a few weeks ago, my NVIDIA video card was damaged. Short-circuited or something, but there's a burn mark over one of the modules and it was preventing my computer from turning on. It had to be taken out or replaced, and because I didn't want to spend the money replacing it, I opted to remove it and just use my integrated graphics card in my laptop.
However, now the fans in my laptop are running at full speed all the time, regardless of CPU/GPU temperature. I've searched over several forums for a solution, and I've looked into several different programs, including MSi Afterburner, NVIDIA GeForce Experience, SpeedFan, Riva Tuner, and RWEverything, but to no avail. Most of them require a video card in order to control the fan speeds, but since I don't have one in my computer, I can't change anything. I've also looked into the BIOS, but it doesn't appear to have any fan controls.
I'm pretty sure the fans are running at full speed because they can't get temperature data from the (missing) card.
Laptop:
- MSi GT60 0NE
- (Had a) NVIDIA GeForce GTX 675M
- Integrated Graphics: Intel HD Graphics 4000
- Running Windows 8
Any help would be appreciated, and I can provide more info if needed! Thanks!
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http://support.apple.com/kb/TS2090
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