PC question.

I am guessing you have a huge ass fan on the side. I had the same issue, but I guess the plastic eventually scraped off since it now doesn't do it anymore.

Is there a disk in the disk drive?

Could be the hard drive or PSU.

Your PC became a rat lair. No need to thank me.

Open the PC and listen for where the sound is coming from :)

If the noise only happens when you're playing with a game, maybe its your cpu or graphics card's fan.

It's sure something with moving parts on it. Like PSU, Fans etc. Just open it up and put your ear close and find the source.
or maybe
Aliens

Would you like the Cyanide or the Bleach?

One of the fans would be my guess. Run speedfan 24/7 from now and check whether anything drops RPMs when you hear that sound because if that happens then that fan is on it's last legs.

Play Sacred 2 while your case is open, check where the sound comes from.Probably your fans need oil or their cables have a problem.

And the problem is only noise ? Nothing else, no slowing,lagging, restarting ? Just a noise ?

Also check your temps and check this.

Ok, just a few minutes ago the scraping/grinding noise happened again, a couple of hours after playing again. The squeaking didn't. I hope it's not my hard drive. I have no money to buy a new one. If it is, well then I guess I won't be on the internet anymore with a pc. Just my phone.

Ok, it's the fan. I opened the case and the inside went on the fan was coated with an inch of dust. Although it still made the noise when I rebooted after but now it stopped. Lets hope this is the end of it all. Thanks to all that actually helped.

It's probably a fan issue. Try opening up your computer and cleaning out the dust from the fans.
[EDIT] Ah, I just noticed you already fixed the problem. :)

That is bad (the dust issue) If your power supply becomes clogged with dust like that and the fan ceases it will go out. Right now that doesn't sound too bad but when your PSU goes out it typically takes other hardware with it. I would suggest cleaning your psu fan with pressurized air in fact clean your whole PC. Just pull off the side panel and go over the inside with a blow dryer (on cool setting) and get that dust out before it causes additional problems.

Ok, issue resolved. It's the GPU fan rattling and whining. Ordered this-

http://www.amazon.com/MSI-DisplayPort-PCI-Express-N760-2GD5/dp/B00DIH8OW8/ref=br_lf_m_9014242011_1_2_ttl?ie=UTF8&m=ATVPDKIKX0DER&s=pc&pf_rd_p=1804012382&pf_rd_s=center-3&pf_rd_t=101&pf_rd_i=9014242011&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0Z73ACJ42FVA6JWAQ7VR

(sorry, not good at making links). FAR better than the AMD 5870 I have that's dying.