I have done a Spybot rootkit scan on my laptop and, apart from a whole list of files in the deep scan system, the quickscan list notes the following hidden files:

Windows folder:
C:\Windows\ @
C:\Windows\~
C:\Windows\a
C:\Windows\8BRs:

System folder:
C:\Windows\System32\

Master Boot records:
Unknown MBRs: PhysicalDrive0

Can someone tell me whether they are of any concern please?

Thanks
Chris