Memory Problems

[Alicika]

Full Spec
Seagate Barracuda 1TB 7200RPM SATA 6Gb/s 64MB Cache
Samsung 120GB 850 EVO SSD 2.5" SATA 6Gbps
Gigabyte Radeon R9 290X OC WindForce 4096MB GDDR5 PCI-Express
8GB Ram - Kingston HyperX 8GB (2x4GB) PC3-14900C9 1866MHz Dual Channel
Intel Core i7-4790K 4.00GHz (Devil's Canyon) Socket LGA1150 Processor
Windows 8.1

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Basically I'm seeing my memory go up to 70-90% in about an hour unless I'm watching a video via YouTube for about 10 minutes, when booted up it's at about 20-30% and when I gets high it affects the performance.

I have searched for malware and stuff like that, and nothing. I'm not using anything memory demanding only stuff like Spotify and IE web searching.

I've had the computer since Monday from OC UK. They did a great job, Probably my fault.

Any suggestions?
Any screenshots? just ask (Ask what you need a screenshot off)

 

[wazza300]

Is windows fully updated? Think I read somewhere that there's a memory leak with 8.1 and its fixed with an update

 

[Alicika]

Is windows fully updated? Think I read somewhere that there's a memory leak with 8.1 and its fixed with an update

Yes, fully updated.

I just play Dragon Age: Inquisition for an hour-ish can the memory is still under 30%
Could it be just when I watch videos?