http://forum.bitcoin.org/index.php?board=26.0

As long as i know this issue is on all windows versions.
Linux systems do not have this problem though.

http://lmgtfy.com/?q=windows+7+graphiccard+model

(http://www.ehow.com/how_4916955_out-graphics-card-windows.html)

Since it is not much better to mine with a NVIDIA card than it is with a CPU (because of the architecture), i guess that the miner software is ignoring any graphiccards that are not from ATI or ATI-based.
I was once able to use my NVIDIA card with the Diablo miner ..maybe you give it a try with it.

oh "khash" ..missed that one. with 0.55 mhash you really need a long time to get a share.
What kind of hardware do you use?

Try to use some more communicative miners like Diablo or poclbm.
They are command line though, but usually telling a bit more in detail where the problem is.

Sorry, just sitting here with a proxied smartphone and i have no clue about the guiminer.
Try to look for a similar problem in the guiminer thread or wait for other people able to help (there seem to be other threads with similar problems like here)

edit: try to use other mining clients as well: http://forum.bitcoin.org/index.php?topic=16766.msg217327#msg217327

Did you search for the "guiminer.log" in your system? Executable directory where you run the guiminer from? Windows/Whatever-Search function?

Did you find the logfile or open up the console?

Here is a similary topic with problems with the guiminer: http://forum.bitcoin.org/index.php?topic=16769.0
Try to look at the "guiminer.log": http://forum.bitcoin.org/index.php?topic=16769.msg217234#msg217234

Quoting myself -> http://forum.bitcoin.org/index.php?topic=3878.msg56190#msg56190

"The console window is hidden by default. It can be shown in its own tab using Help -> Show Console. Log messages are also redirected to 'guiminer.log' in the executable directory if you want to look at them after."

There should be a "guiminer.log" somewhere - i guess there will be more details in it.
I am not using that gui, so i am not able to tell you where exactly it is ..try to search for it in your system (maybe it is specified in some options)

That is pretty much up to yourself. I registered to a couple of pools, tried them all out and switched to that one i was most comfortable with.
There is no "best pool" and everybody is only able to tell you his/her prefered pool ..try them, compare them, stick to the ones you "like"

Does your client say anything about "Block XY found"? Please post some of your client output - otherwise we are just able to guess

It would help if you describe your problem in detail... 

(http://www.wikid.eu/index.php/Problem_definition)

Sorry, it is port "8333" - mistyped it. Well, like swusc2 already wrote you need to search for your router in the internet and look for a tutorial. Look for keywords like "port forwarding <vendor> <model>".

lol - put that JPG into your bitcoin client - maybe some coins are hidden in it

I had some problems as well (0-1 connections) and fixed it by adding a port forwarding rule (port 8333) in the router to my computer.
Guess the client got some problems to connect if there is no non-established way back.

Did you use the "Back"-Button? I occurs to me as well when i do that, but after a real refresh everything is fine.

Like in the normal life and with other ebay goods - sometimes there are people like this.
If i were you and i had no chance to get with the buyer in contact (after a couple of days of course) i would try to contact the second best buyer or restart the auction.

Usually you can contact eBay and ask for help, but since Paypal (belongs to eBay) is a bit of a problem with Bitcoin it might be that they won't help you.