Hi,
If you post a screenshot of QUEUE CONFIGURATION and QOS CLASSIFICATION, I should help you a little bit better.
Anyway, QUEUE configuration is HOW QoS manage the traffic. Basically you may have 3 types of queues:
1) First In First Out
2) Priority (usually based on policies)
3) Weighted Fair Queue (low traffic will be preferred instead of high traffic)
Check here:
http://support.microsoft.com/kb/233039/en-us
QoS classification is made on the traffic type, again, if you post a screenshot, I should be able to explain settings...
Regarding your last screenshot:
DSCP mark should be implemented with caution. I THINK it has been invented by Cisco but I'm not sure. Anyway, this is used to FINE TUNE the QoS. Now the point is simple: let's say you have ONLY 2 types of traffic: VoIP and HTTP. You can give more priority to VoIP and the rest for HTTP. But if you have burst (or unpredictable) traffic, you MUST use more than one policy unless you want to choke your network.
With cisco's routers you can create access-lists and define DSCP mark for each protocol. With your router I think you can't do that. So, my suggestion is: unless you really notice a problem (VoIP calls are not possible or other), let DSCP mark off ( NO CHANGE -1 ). Actually I don't know what does AUTO MARKING mean... probably it's something like "The router tryies to determine the best policy"... anyway... I'm not sure...
I hope this can help you in some way.