Avast antirootkit hidden key Superfetch - VirtualStoreSize

Viruses and worms
1

Hello, today full scan found one hidden key which i see first time.

Registry item [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Superfetch] VirtualStoreSize=1280 HIDDEN

It is strange because if i run regedit i found this key visible but value is 1267.

What this is means? It is harmless and normal behaviour? Thank you.

2

http://bfy.tw/CqqS

3

Thanks for answer but you should not use those kind of links because no one know where will be redirected.
Anyway after restart PC and after next full scan this hidden key not be detected anymore.