I know it can be frustrating. The way many AV or anti-virus programs work is by actively scanning your machine to prevent threats. When this happens, it can cause a higher-than-normal CPU usage. Unfortunately, this can slow down the other processes you are doing on your computer at that time.
The good news is, the ccsvchst.exe file isn’t a TRUE required system file on your Windows computer for it to work properly. Though it is necessary for Norton (or other Symantec products), it won’t blow your computer up if the process ends.
Some people have said the file itself causes additional memory issues with specific versions of Service Packs installed in conjunction with Windows. No matter what, it’s important to have all your updates and SP updates with Windows, whether you are using XP, Vista, 7, or 8. Here’s a link to the Norton forum where users have posted similar thoughts.
What is the CcSvcHst.exe file?
As I mentioned above, it’s not actually a bug or a virus within the Norton program. It’s required to run some of the applications. It may be responsible for scanning and assisting your computer in preventing viruses and other dangerous files from being downloaded and installed. The ccsvchst.exe file is vital for proper usage of these applications and should NOT be deleted or moved if you want to be able to use the software continuously (and properly).
Also, this process may start more than one instance. That’s usually ok too so don’t be too worried unless you get tons of errors.
Regardless, keep your computer working as it should and keep the process working and you should be fine. If the 99% usage gets annoying, just turn off your program while you are working or playing a game.