i can not find the help file

Avast Free Antivirus / Premium Security
1

i have installed avast home on my computer. but i can not find the help file, why? can you explain in ?

2

Start the anivirus (right click the ‘a’ blue icon and choose it to start).
Click over the program interface and press F1.
Also the files are into \English\Help\ folder

3

You can find it in avast installed file

4

i am sorry. Popup Message said a unknow error. i am the chinese-simplify version. the message as fellows:
C:\Program Files\Alwil Software\Avast4\CHINESES\HELP\Help.chm::/popis_okna_iednoducheho_ovi.