Download GPU-Z, it is free. Check temperatures and other important data [mostly 2nd page]. I use that program from time to time, as it is a good little diagnostic tool, get the latest version here
More often I use AIDA64 Extreme, I cannot remember if I purchased it, however, you can do much more than stress test parts of your computer, you can also see what is going on, live. A very good tool. -- I use MSI Afterburner, mainly to increase the fan speed at specific temperatures to keep it cooler than ATI's driver/CCC will, it is also free, and, it does not matter what video card you have, I think you can use it beginning with ATI's HD 4000 series cards and up.
Make sure nothing is over heating. Heat causes bad things to happen, including damaged hardware. If you have not cleaned your computer for a while, get a can of compressed air at Wal-Mart, computer store, even Home Depot sells it. Clean all the fans and heatsinks to get the filth out, remember to use it on your power supply as well, it gets dirty also.
If you have cleaned it and still have a problem, try other free options, such as newer drivers, I download the Beta driver from AMD, enter control panel and remove CCC and let MSI Afterburner control my fan and any overclocking I want done. You do not need a video card by MSI to use this tool, it has it's roots in RivaTuner. I have a Sapphire R9 290 [reference edition] and it works fine. -- Note when you download the drivers make sure you know where you put the file, so you can easily find it.
Edit: for Kar1zma89 - Note: I kept losing data when I posted this, I hope this last try works properly.
.Edited by Dan848 - 3/27/14 at 9:58am