New PC Problem

Jun 30, 2018
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Hello i am in need of some help i just got a new gaming pc and there is a problem with it, when i start it up it is really quick and in no time gets to the desktop but after around 1-2 minutes the fan's kick in and its like a jet engine starting up everything starts up slow and games have 2-3 fps.
Here is my specs
Operating System
Windows 10 Home 64-bit
CPU
Intel Core i7-8700k @ 3.70GHz
Coffee Lake 14nm Technology
RAM
16.0GB Dual-Channel Unknown @ 1498MHz (15-17-17-35)
Motherboard
Micro-Star International Co. Ltd. Z370 GAMING PRO CARBON (MS-7B45) (U3E1)
Graphics
U2879G6 (3840x2160@30Hz)
3071MB NVIDIA GeForce GTX 1080 Ti (Gigabyte)
Storage
238GB Hitachi HFS256G32TNF-N2A0A (SATA (SSD))
1863GB Seagate ST2000DM006-2DM164 (SATA )
232GB Samsung SSD 970 EVO 250GB (Unknown (SSD))
Optical Drives
No optical disk drives detected
Audio
Realtek High Definition Audio
Just opened up speccy and my cpu temp is 99 'C

If you can help i will forevery be grateful.