Right Click "Computer" and go to Properties. This should display any service pack information.
IME, I have seen this happen on systems that were in some way malfunctioning, from either faulty Windows core structure or malware. I wouldn't be too alarmed about it but I would run some quick maintenance.
Unlpug your PC and press the power button a few times to flush the RAM.
While booting, press F8 before you see the Windows Loading screen.
Select "Safe Mode with Networking"
and scan for|remove any harmful programs.
Boot into Windows , run a command prompt (Windows Key + R) > Type "cmd" > Enter) and type:
Allow it to reboot and check the disk for defects. Once able to login, another command prompt and type
To make sure that the Windows Core files are not damaged.
This may result in nothing, but any failing process (e.g. Updates) potentially expose other issues.