"Invalid TCP Flag Attack" from advertiser here?? (doubt it!)

My Norton Internet Security just said my computer had been accessed in a manner characteristic of an "Invalid TCP Flag attack"

The tracker gave this info about the source:

IP no. (I think!) 64.70.54.44
adclst03.value click com
Cable and Wireless
ExCW
Cary NC
27511

It said this re such an "attack"
Invalid TCP Flags
Severity: Medium

This attack could pose a moderate security threat. It does not require immediate action.

Attack Category: Pre-Attack Probe

Pre-Attack probes gather information about a system necessary to launch an attack. A pre-attack probe signature might detect a UDP scan, for example, which an attacker could use to identify all live systems on a network.

Description

This attack signature detects TCP packets that have invalid combinations of flags in the TCP header. e.g. TCP packets that have both the FIN and RST bits set. This intrusion also detects packets that have the TCP reserved bits set.

False Positive

Certain Internet devices, typically routers, sometimes violate the specifications for TCP flags and set the reserved bits to 1.

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I assume this was the Norton being a nervous Nellie???? It has reason to be - my system just crashed! And Microsoft doesn't know why. lol

Just thought it was worth letting you know Craven - in case it actually WAS something odd from here.