Download this run it on that computer. This will import some registry info for it into that PC's registry
http://download.bleepingcomputer.com/win-services/7/BFE.reg
Then this http://support.microsoft.com/mats/windows_security_diagnostic/
If that doesnt work
This
Go to start/run type regedit
Then do this
a. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\BFE
<- this is whats giving you that error 5
b. Right click on it-permissions
c. Click on ADD and type
d. Everyone and click ok
e. Now Click on Everyone
f. Below you have permission for users
g.Select full control and click ok
h. Now, open RUN and type
i. services.msc and click ok
j. Start base filtering engine service and then windows firewall service
Then...