stock cpu fan replacement suggestion

[associates]

Hi,

I was wondering if anyone here would be able to help me out. I built my own PC like a couple of months ago. Everything has been OK except couple of things.

1. the stock cpu fan (that comes in the box together with CPU) is a bit noisier or louder than normal. I left it there because I thought I could put up with it. But today it's really loud. I was thinking of replacing it. I'm hoping if anyone might be able to share with me what kind of cpu fan I might get. The cpu I have installed is Intel Core i7-6700 3.4G Quad-core Processor.
By the way, the apps I'm currently running are excel, curse gaming, firefox.
I use speccy to tell me the temperature of CPU and it's showing 29 degree C

2. The other issue I'm having is that as soon as I close an application like WoW apps (full size screen), it closed but it did not close completely - there are some still left on the screen and when I moved my file explore window and hover over it, it then goes away. It's like it's stuck on the screen and the only way it goes away is to hover any windows over it (like an eraser in the mspaint). Sorry I don't know the word for this. I hope I explained it ok.
It seems to me that the memory is not sufficient or something.

here is my system hardware details:
CPU Intel - Core i7-6700 3.4G Quad-core Processor
Mobo - Gigabyte GA-B150M-D3H Micro ATX LGA 1151
Memory - Corsair Vengeance LPX 16G (2x8G) DDR4-2400
Storage - SSD Sandisk SSD Plus 240GB 2.5"
Storage - HDD Seagate Barracuda 2T 6Gbps
Video Card - MSI GeForce GTX 1060 Gaming X 3G
Case - Deepcool Tesseract SW ATX mid tower case
PSU - Antec High Current Gamer 520W 80+ Bronze Semi-modular ATX PSU

Look forward to hearing from anyone.

Thank you in advance for your help and support.

 

[Dark Lord of Tech]

Not sure about the other issue , but here's a decent cooler.
PCPartPicker part list / Price breakdown by merchant

CPU Cooler: be quiet! Pure Rock Slim 35.1 CFM CPU Cooler ($39.00 @ PCCaseGear)
Total: $39.00
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-01-31 14:28 AEDT+1100

 

[Sam Hain]

The stock cooler seems to be doing it's job as far as temp, but as you note it's got a lot of db... A hydro-bearing fan will run more quite and last longer than the stock fan, as it's more than likely a sleeve-bearing type.

Second option, even though you're not OC'ing and provides quite and very cool temps is this and should fit your case, just check for RAM clearance: https://pcpartpicker.com/list/9RwYcf

Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler $37.88 -$10.00 ($10.00 mail-in rebate) $27.88
OutletPC


EDIT: Performs close to the suggestion of SR, but I believe his suggested cooler might have the overall edge for more quite operation between the two after doing some reading...