I am attacked by spyware(or malware). What to do? Avast is doing nothing :( :( ?

Just before two days I’ve downloaded a crack file and when i executed, shit, it was a spyware, Avast 4.8 home has detected it but doing nothing.

In general it is Ok, but whenever i connect my system to internet it says “C:documents & settingsapp data..456.exe” and some other files. Then it creates some Executable files in “C:” (windows drive).

I tried to find files by registry editor, but nothing worked.

Do i need to download any anti spyware program, if so then which is best and freely available?? or can I get rid off it by my Avast only?

There was also a message like rootkit hidden file.

Helppppppppppp. Thanks.
As u said guys, i have installed MalwareBytes’ anti malware and it has deleted some malwares as well, but Avast is still showing threats in form of ROOTKIT: HIDDEN FILE. I click on delete but when I restart my system it again shows error. What am I supposed to do???

Path is : C:windowssystem32driversvibkdmzedumc.sys

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