Is 90c high ? (i7-7700k)

That's way too hot at load. What are you using as a CPU cooler?

That's pretty hot yes. What sort of case cooling do you have setup and what are your ambient room temps where the pc's located?

It's possible you may not have gotten the cooler mounted quite flat, to remount it would require cleaning off thermal paste from both cpu and the base of the cooler with a lint free cloth and some isopropyl alcohol, reapplying fresh thermal compound and making sure to tighten the cooler just a turn or two at a time on each of the screws. Work in an "X" shape, ie top left, bottom right, top right, bottom left and repeat. Tightening one too far can cause the cooler to mount a little crooked/uneven.

There's also a screw in the middle of that cooler under the cooling fins, you can try turning it a little (clockwise) to tighten and increase mounting pressure. Just don't crank down on it too hard, excessive pressure may damage the newer cpu's that use a thinner pcb than previous (4th gen and earlier) models.

What program are you reading temps in? You might get better results using something like realtemp.
https://www.techpowerup.com/realtemp/

Here is a temp guide with references to core temps on the cpu you're using.
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

If nothing else works you may need a better cooler. Something like a scythe mugen 5 should work. It's no taller (a bit shorter) than the 212 evo. The mugen 5 cools similar (within a couple degrees) of a larger nh-d15s and is offset to prevent ram conflicts.
https://pcpartpicker.com/product/q9QRsY/scythe-mugen-5-512-cfm-cpu-cooler-scmg-5000

Some reviews.
http://www.modders-inc.com/scythe-mugen-5-cpu-cooler-review/4/
https://www.nikktech.com/main/articles/pc-hardware/cpu-cooling/cpu-air-coolers/7565-scythe-mugen-5-cpu-cooler-review?showall=&start=5

Removing heat is essentially a physics issue, so it's either a reporting error or a physical heat transfer/CPU fan issue. Have you tried other software to look at temperatures? Might as well get that out of the way first.

You could try going into the bios and setting the core voltage (vcore) manually. It's possible left on auto it's providing more voltage than necessary which will cause excessive heat. It needs enough vcore to remain stable but anything beyond stable is excess. For instance if your cpu can run at 1.2v stable but auto has it closer to 1.28v it will run hotter with no gain.

It was mentioned that it's pretty hot, does that include ambient room temps? Keep in mind that cooler performance in tests and benchmarks are usually done in a room that's around 22c (what's considered 'normal'). If the room your pc is in is significantly warmer, around 30c or higher then that won't help matters. Ambient room temps have a roughly linear effect on cpu temps. Use of an air conditioner to drop temps 10c will drop cpu temps by around 8-10c.

Along with being a bit hot right now several things in combination are likely working against you. The 212 evo is a budget cooler, hot temps, high clock speeds out of the box. A faster/hotter running cpu already needs adequate cooling, even more so when it's above average room temp.

The 212 evo does ok for the price but it's at the lower end of performance. Even with a second fan on it the cooler doesn't benefit too greatly. Maybe 1-3c or so. It's what's called a 'push/pull' setup and that really only benefits tightly spaced cooler/radiator fins or thicker coolers. From front where the intake fan is mounted to the rear the 212 evo just isn't that large and a single fan is pretty efficient.

Just out of curiosity since you mentioned 2 fans on the cpu cooler, they're both blowing the same direction right? Ie the front fan is pushing air to the rear and the back fan is also pushing air to the rear? Just making sure you didn't accidentally mount the rear fan backwards with both fans blowing toward one another and cancelling each other out. All in all sounds like you're a good candidate for a better cooler.

Spiking when opening programs isn't abnormal, the cpu can go from idle to 50% load rather quickly and temps follow. In the 60c range isn't troubling, breaching 90c is. It will thermal throttle at around 100c and automatically reduce clockspeed to reduce temps to a safer level but it's not good for it to run that hot all the time. More of a failsafe to prevent catastrophic failure than it is a normal running condition.