Tcp Errors (netstat -s) Help/Questions

Hi All,
As a bit of a background, I've been having issues with Valve/Steam games online. Specifically Left 4 Dead. Lots of disconnects, very unstable online experience, with very little help from the publisher. I am running Vista Home Premium x64, connected wirelessly to a DLink 4300 router (newest firmware).

I pass all network diagnostics, tests, specs, etc... and do not have issues with anything else. (Online gaming wise).

The following is my netstat info, and a lot of the errors trouble me. This was taken while on WoW, with a few other normal things going on in the background.

Any ideas? Or no issues?

IPv4 Statistics
Packets Received = 4789988
Received Header Errors = 0
Received Address Errors = 5
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 603
Received Packets Delivered = 4849218
Output Requests = 3550509
Routing Discards = 0
Discarded Output Packets = 6171
Output Packet No Route = 18
Reassembly Required = 147
Reassembly Successful = 69
Reassembly Failures = 69
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0

TCP Statistics for IPv4
Active Opens = 6724
Passive Opens = 49860
Failed Connection Attempts = 2757
Reset Connections = 5342
Current Connections = 1
Segments Received = 4733537
Segments Sent = 3214095
Segments Retransmitted = 211043

UDP Statistics for IPv4
Datagrams Received = 112190
No Ports = 589
Receive Errors = 5
Datagrams Sent = 124638

Just a little bump in case anyone missed it and has any insight. Thanks ahead of time.