Computer froze and fan started going faster by the second. What could've happened?

I was using my computer (MacBook Pro Retina 13") and suddenly it froze and the fan speed was going higher by the second. I had to switch off the compute before something serious happens.
I did the EtreCheck after reading some of the responses. Hope this helps in figuring out what is going wrong. Also how to minimise the CPU usage and reduce the RAM as well?
Problem description:
My computer froze and the fan (I guess it was the fan) starting blowing harder and harder and harder by the second. I got worried that It might blow up or burn up so I switched it off immediately. Most of my memory is used up by Kernel_task and I am not sure what that is!
EtreCheck version: 2.1.1 (104)
Report generated December 9, 2014 at 11:55:35 AM EST
Hardware Information: ℹ️
MacBook Pro (Retina, 13-inch, Late 2013) (Verified)
MacBook Pro - model: MacBookPro11,1
1 2.4 GHz Intel Core i5 CPU: 2-core
4 GB RAM Not upgradeable
BANK 0/DIMM0
2 GB DDR3 1600 MHz ok
BANK 1/DIMM0
2 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Video Information: ℹ️
Intel Iris -
Color LCD spdisplays_2560x1600Retina
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: 0:10:51
Disk Information: ℹ️
APPLE SSD SD0128F disk0 : (121.33 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / : 120.11 GB (19.59 GB free)
Encrypted AES-XTS Unlocked
Core Storage: disk0s2 120.47 GB Online
USB Information: ℹ️
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/Applications/ExpressVPN.app
[not loaded] expressvpn.tap (1.0) [Support]
[not loaded] expressvpn.tun (1.0) [Support]
/Applications/Parallels Desktop.app
[not loaded] com.parallels.kext.hidhook (9.0 23136.932290) [Support]
[not loaded] com.parallels.kext.hypervisor (9.0 23136.932290) [Support]
[not loaded] com.parallels.kext.netbridge (9.0 23136.932290) [Support]
[not loaded] com.parallels.kext.usbconnect (9.0 23136.932290) [Support]
[not loaded] com.parallels.kext.vnic (9.0 23136.932290) [Support]
/Applications/VMware View Client.app
[not loaded] com.vmware.kext.vmioplug.10.3.20 (10.3.20) [Support]
/System/Library/Extensions
[not loaded] com.nike.sportwatch (1.0.0) [Support]
Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist [Support]
[invalid?] com.nike.nikeplusconnect.plist [Support]
[loaded] com.oracle.java.Java-Updater.plist [Support]
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Support]
[loaded] com.google.keystone.daemon.plist [Support]
[loaded] com.microsoft.office.licensing.helper.plist [Support]
[loaded] com.oracle.java.Helper-Tool.plist [Support]
[loaded] com.oracle.java.JavaUpdateHelper.plist [Support]
[loaded] jp.co.canon.MasterInstaller.plist [Support]
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist [Support]
[running] com.spotify.webhelper.plist [Support]
User Login Items: ℹ️
Garmin Express Service UNKNOWN (missing value)
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Google Drive Application (/Applications/Google Drive.app)
Internet Plug-ins: ℹ️
FlashPlayer-10.6: Version: 15.0.0.239 - SDK 10.6 [Support]
Default Browser: Version: 600 - SDK 10.10
AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 [Support]
AdobePDFViewer: Version: 11.0.09 - SDK 10.6 [Support]
Flash Player: Version: 15.0.0.239 - SDK 10.6 Mismatch! Adobe recommends 16.0.0.235
o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 [Support]
QuickTime Plugin: Version: 7.7.3
SharePointBrowserPlugin: Version: 14.4.6 - SDK 10.6 [Support]
googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 [Support]
Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Support]
JavaAppletPlugin: Version: Java 7 Update 71 Check version
User internet Plug-ins: ℹ️
Google Earth Web Plug-in: Version: 7.1 [Support]
Safari Extensions: ℹ️
OpenIE
3rd Party Preference Panes: ℹ️
Flash Player [Support]
Java [Support]
Time Machine: ℹ️
Skip System Files: NO
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 120.11 GB Disk used: 100.52 GB
Destinations:
FreeAgent Drive [Local]
Total size: 249.72 GB
Total number of backups: 3
Oldest backup: 2014-10-09 16:35:45 +0000
Last backup: 2014-11-13 01:12:02 +0000
Size of backup disk: Too small
Backup size 249.72 GB < (Disk used 100.52 GB X 3)
Top Processes by CPU: ℹ️
      10% Dropbox
      9% WindowServer
      2% Safari
      1% coreaudiod
      1% Activity Monitor
Top Processes by Memory: ℹ️
271 MB Safari
120 MB Dropbox
120 MB WindowServer
99 MB Dock
86 MB Google Drive
Virtual Memory Information: ℹ️
87 MB Free RAM
1.66 GB Active RAM
1.45 GB Inactive RAM
835 MB Wired RAM
8.46 GB Page-ins
17 MB Page-outs
Diagnostics Information: ℹ️
Dec 9, 2014, 11:48:14 AM Dropbox_2014-12-09-114814_Abdulrahmans-MacBook-Pro.cpu_resource.diag [Details]
Dec 9, 2014, 11:48:06 AM Skype_2014-12-09-114806_Abdulrahmans-MacBook-Pro.hang
Dec 9, 2014, 11:45:18 AM Self test - passed
Dec 9, 2014, 10:33:03 AM cloudd_2014-12-09-103303_Abdulrahmans-MacBook-Pro.crash
Dec 7, 2014, 04:35:23 PM cloudd_2014-12-07-163523_Abdulrahmans-MacBook-Pro.crash
Dec 7, 2014, 03:29:54 PM StataSE_2014-12-07-152954_Abdulrahmans-MacBook-Pro.hang

Hello Abed88,
Thanks for using Apple Support Communities.
After you restarted your computer did the issue where your fans were spinning at a high RPM and the Mac became unresonsive come back? If so I recommend that you start with doing an SMC reset.
Resetting the SMC on portables with a battery you should not remove on your own
Note: Portable computers that have a battery you should not remove on your own include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
Take care,
Alex H.

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