Sausage Meat :
Realtek will be the driver for your sound card. If you uninstall it you may lose your sound.
It's not a virus so you should be okay just leaving it
I have a Probook 4530s- Windows 7 Professional 64-bit. I was not looking for this RealTek info. BUT, about 1.5 years ago, my foreground screen borders kept flashing after some maintenance. I tried to get HP (they eventually conceded to install a new motherboard thinking it was my video card - not solved), and several top virus companies to help solve. None could.
So I finally did a "divide and conquer" (may be an actual statistics term for this methodology - Binary Search?). Turned half of the Services off (unchecked them) - still a problem? Problem program must be in the half left on (checked).
Kept cutting them in half again and again (with system restarts each time) until I found the program >> RtlISMServ <<< in the Windows 7 Services. I know this is the culprit as if I forget to disable it, the problem of flashing foreground border screen returns.
The reason I am posting is due to seeing you mention this has something to do with sound. My Bluetooth is broke as no sound comes out of my Bose Wave radio when I have it connected to the ProBook via my Belkin A12 SoundStream adapter. This Belkin is a Plug 'N Play (PnP) so no driver for it. And all connections seem good. I think my Bluetooth drivers got regressed is the real problem. But thought I'd mention this RealTek program in case anyone else gets my problem with flashing Screen Border. It is a very pain-in-the-?ss as you won't be able to type a consistent string of characterless on any screen in the foreground. The flashing keeps erasing them.
If any maintenance hit this program, it did not fix it as mentioned today (20/27/15) accidentally left it on, and the screen flashing returned. Forget telling RealTek in Asia (Taiwan?) - they did not understand the problem and/or care - ditto for HP.
PS. Path from Properties if it: C:\Program Files (x86)\Hewlett-Packard\HP Internet Sharing Manager\HP_UI\RtlService.exe
Since it is part of HP Internet Sharing manager, what is the connection to sound?