Martin
Cheers! That was exactly the problem. I didn't pick up on the origional post as the error code wasn't the same until the re-install, sorry.
I've just fired it up on my netbook at work (this too has Kaspesky) and this suffers the same until you disable the protection.
I do find Kaspesky to be poor, I've had many problems with it, port settings opening and closing when they like etc and their support is very poor. It WILL now be removed and replaced with something better, it may be cheep.....You get what you pay for...
Cheers again
Rick.