New build has started to act sluggish.

Hey guys,
I'm new to this so go easy on me.
Anyway, I completed my first new build a few weeks ago and all has been well and running smoothly up until recently. It has started to act slow and not respond to clicks when opening/closing menus, starting/ending programs etc.
It doesn't freeze completely as the mouse cursor can still be moved and whatever program is running will continue to run without stalling, although nothing can be selected.
It also goes through spells of not stalling at all.
There are no sudden leaps in cpu usage or temperature and they seem to be stable.

Here are my specs:

CPU: Intel Core i5-2500K 3.3GHz Quad-Core Processor
CPU Cooler: Cooler Master RR-910-HTX3-G1 54.8 CFM Sleeve Bearing CPU Cooler
Motherboard: Gigabyte GA-P61-USB3-B3 ATX LGA1155 Motherboard
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1333 Memory
Hard Drive: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive
Hard Drive: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive
Video Card: Sapphire Radeon HD 5450 1GB Video Card
Case: Cooler Master CM690 II Advanced ATX Mid Tower Case
Power Supply: Corsair 600W ATX12V Power Supply
Optical Drive: Asus BC-12B1ST/BLK/B/AS Blu-Ray Reader, DVD/CD Writer
Windows 7 UE

Thanks for help in advance.
7 answers Last reply
More about build started sluggish
  1. Do you torrent files? What have you downloaded recently? Aside from a faulty piece of hardware it sounds like you may have a virus
  2. You haven't filled up most of a hard drive, have you?
  3. He has 2 TB.... unless he's on the FBI watch list for pirating I'm pretty sure it's not even close to full
  4. Just making sure. That'll make a system majorly sluggish. I don't know, maybe the OP likes to rip DVDs onto just one of the drives.
  5. I checked for viruses and nothing came up, and both drives are almost empty.
    Where can I begin to search for the fault?
  6. Is there at least anything I can try to source the problem?
  7. I have ruled out that it's the HD and GPU. I will reseat the CPU and if that doesn't work then I reckon it must be the MB.
    What you think guys?
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