Windows 7 - Warning message

Windows7 SP 1 32bit
BIOS Award V6 00PG
Gigabyte H55M-D2H rev 1.4 500Gb hdd

Intel Core i3 550

Memory 2 x 4096

Nvidia GeForce GTS 450

Controller Intel 3400 2port ATA- 3B26
Comodo Firewall and Avast Anti virus

Hi
    Since I installed Windows7 each time that I turn on the PC I get a warning that " WinPK filter is missing or failed to load " Does anybody know what a PK filter is and what this warning is for?  Regards Robert.
  
  

Many thanks for your quick reply Pete.
My version is Windows7 Pro SP 1 32 bit, I have only had it a few weeks, and as I have been continually trying to get my programs and printer drivers etc etc, working with it, I haven't found my way about the prog yet or found the event log.
There is also  another warning of " One of the passed string parameters is empty " that I don't understand, but as it's given by my Comodo firewall, and as you mention firewalls it might be connected, when I first saw this warning I did uninstall the firewall and then reinstall it, but it didn't shift the warning.  Regards Robert. 

Try these steps

Go to 

Network and sharing centre-->Network connections-->r/click on wirless network-->properties 
untick and uninstall WinpkFilter Miniport drivers from this list.

Reboot Try this and let me know Regards

if its bugging to you , you can go to Run >> msconfig and remove that WinPKfilter program from startup that causes Error.  

This is because corrupted or damaged WinpkFilter, you can renistall new winpkFilter. you can download it from
http://www.brothersoft.com/winpkfilter-94647.html

Hi guys
     My thanks for your help it's most appreciated, here is the update for your info, I have tried looking for the winpk in wireless networks and it's not there, or I could not find it anywhere, as I think 7 SP Pro must be a bit different to other versions, next I looked in msconfig and nothing like winpk is listed in the Services or Startup tabs, so I tried the download from Brothersoft, the hard part was it took 10 mins to figure out what to click on to start the donload, (you can end up witha folder full of Chrome etc if your not careful) but anyway it came and it installed, and after two reboots it looks like a SUCSESS the warning has gone so my thanks to all, but I would like to know what the winpk filter does, if anybody could explain in simple silver surfer terms, regards Robert.  

WinpkFilter is a high performance packet filtering framework for Windows 9x/ME/NT/2000/XP/2003/Vista/2008/Windows 7/2008R2 that allows developers to transparently filter (view and modify) raw network packets with minimal impact on network activity without having to write low level TDI or NDIS driver code.

WinpkFilter is more than just a firewall development kit for Windows. With WinpkFilter you can make an application that inserts itself into the Windows network stream: custom firewall solution, internet connection sharing (NAT), IP shaper, VPN and many other low-level network solutions completely in user-mode using your favorite development environment: Visual C , Delphi, Visual Basic, C Builder and etc.

Using WinpkFilter requires no experience in kernel mode programming on your behalf since WinpkFilter provides you with powerful user level API. However, if you need to implement your solution (to achieve better performance) in kernel mode you can use well-documented raw IOCTL interface as well.