[HELP] Alienware Aurora R4 - Loud fan's noise !

Hi !

I bought my Alienware Aurora nearly a year ago, and since a few months (2 or 3 month) ago my system fan makes a HUGE noise everytime I play a game.

My PC:

Intel(R) Core(TM) i7 -3820 CPU @GHz   / / 16GB Ram  // Seagate 1TB  // NVIDIA GeForce GTX 660

The PC stays quiet when i'm on the internet or on desktop but it's really disturbing on game, I can't hear anything without having my headphone on and it's really annoying for those around me.

My fans on PCI or HDD are around 1100 RPM but the fan's system goes around 3800 RPM when I'm on a game !

Some screenshot - in game

On this one you can see that the fan's system is at 4200 RPM when I'm running Battlefield 3

On this one I used RealTemp to check the temperature of my PC, said it's around 90°C !! How can this be possible ?

I've seen other subject on this forum & other, my problem seems to be known but even if I tried to upgrade the BIOS + uninstall / reinstall the Alienware Command Center (deleting .ath & the profile.xmg) + cleaning my fan it still won't work.

I've seen on the internet that the heat sink might not work as it should be and making the system fan going 100% !

Then i'm having a problem, I'm no good with computer and I don't know what the heat sink is (inside my PC) and what should I do with it... I'm afraid that if the fan's keep up like this it'll break or something and lead on a further and bigger problem.

I'm wondering if you can help me, maybe something I didn't try out yet ? Or should I call the Dell Support, my Alienware is still on guarantee but I don't know if I have to pay any fee or anything if you can highlight me on this it would be great.

I'm French, I'm sorry for my english but it seems the EN community is moving way more faster than the French one.

Thanks in advance,

Simon.

Edit : I've also tried the Power Draining (unplugging the power then pushing the power button for 30 secs).