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I don't have this problem, but I don't run Win8/8.1 everyday; mostly in run Vista, Win7, or Win10. I do use Real Player (haven't seen that name change you mention) frequently. You could have a software problem or a hardware problem; there are a few things to try to narrow it down. Or you can take your computer into your local repair shop and pay them to figure it out.
Here's some things you can try:
#1: Scan your computer for new viruses or spyware. Use your built-in anti-virus or download Malwarebytes free from malwarebytes.org.
#2: Try downloading the Win8.1 compatible RealPlayer onto another computer you or a friend has, and see if you get the same result. If it works on the other computer, you still have something wrong with
YOUR computer.
#3: You could have a coincidental hardware failure; test your hard drive with free
SEATOOLS drive diagnostic; if
SEATOOLS reports any errors, your hard drive has failed and must be replaced.
#4: Same as #3, but test your RAM sticks with free
MEMTEST diagnositc (Google to find it). Run a minimum of 8 passes which could take as long as 24 hrs. continuous to test. If
MEMTEST returns any errors, replace any or all sticks with errors and retest until
MEMTEST can complete all 8 passes without errors.
#5: Uninstall your 2 browsers 1 at a time; first Firefox, then Chrome. Reinstall one or the other and retest RealPlayer.
If you still have the problem, post back your results, and we can advise you further.
Best of luck,
<<<BIGBEARJEDI>>>