BSOD help

Hi, I have been experiencing BSOD's for a while now.
I thought I fixed it (scanned pc and removed malware) as they didn't occur anymore, but now I have had 2 BSOD's in less then 24 hours.

- 64 bit Windows 7 Home Premium
- Not the original OS on my system, I reinstalled Windows 7.
- OEM version
- The PC is ~1,5 years old.
- Not sure when I reinstalled my OS, but it is less then half a year ago.

Here is a picture of the BSOD:
*Clicky*

Remove any Zone Alarm software using the removal tool

If you are not using this software update your networking drivers

Code:

BugCheck 7F, {8, 80050031, 6f8, fffff80002a94e59}

Probably caused by : NETIO.SYS ( NETIO!CompareSecurityContexts+6a )

Done, will bump thread if this problem occurs again.

Thanks for the help.