Vista - Problem playing video in Media Center

Normally with wireless networks one would start at the router (set the SSID, Passphrase,...etc) and work toward the devices, but this is Vista we're talking about. And since Vista couldn't find an ass at a donkey farm, muchless a computer on a network, I had to change my approach when working with Vista,... ass backwards. Try this method. Click on "Start", "Network", "Add a wireless device". Allow Vista to search for wireless device. Disregard any devices that it may find, and continue with "I want to add a wireless device or computer that is not on the list using a USB flash drive", at the bottom of the window. Choose "Add the device or computer using a USB flash drive". Click on "next". You should see your local terminal listed, if not, "Create a new Wireless Network Profile". Set your SSID and Passphrase. You may want to "copy and paste your choices to notepad for future reference. Save your settings to your USB flash drive. Insert the USB flash drive into the other laptop and run the wireless setup wizard. Now open your routers web base page...192.168.1.100 for linksys...you'll have to find the right one for your particular manufacturer. If your router settings are stored locally or web based, make the new chages to the SSID and Passphrase. Restart all computers and they should all be able to view each other. Good Luck.

Hi:
Just installed vista x64 SP1 with all latest updates, installed latest Shark codecs and K-lite codecs.
Have no problem playing video files in Media player, but the same video files are not properly played in MediaCenter. They blink from time to time. It looks like a problem with codec, but after installing Shark and K-lite codec packs the problem still the same.
May be Media center gets different codec. How do I change it?
Any idea?

My second question is:
How do you add extra programs to Media center in vista x64?
In XP MCE 2005 you could just drag desired program to the start button and prop it there and it would end up in MCE.
It doesn't allow to the same in Vista MCE.
If you drag the program to start button it will open MCE, but you won't find the added program in MCE.
Could you help?

Thanks!!!!!!!!!!!!!

I too am going completely insane with Media Center. Any video I play AVI, MPEG, DVD etc, it doesnt seem to matter, plays fine as long as A: the window is minimized and B. I dont bring the mouse anywhere near the open window. When MCE is maximized I have to keep the mouse moving for good playback. As soon as I stop moving it and the controls retract whatever image was on the screen at that point flashes while the video plays on. If the window is minimized the video will play just fine unless the cursor moves to that window and the controls appear. Once they do the screen freezes and stays frozen for about ten seconds and returns to normal playback. I have installed all of the latest Vista 32 and 64 codecs (shark and k-lite) as well as the latest ATI driver. I've tried all resolutions from the lowest to the highest. And it does this no matter which monitor I have MCE playing on. (1024x768 LCD and 1920x1080 DLP) All other players do just fine. I built this machine for this purpose and it is really frustrating. Please help.

My system is as follows:

Vista Ultimate x64
ATI Radeon HD 4670 512MB
4GB G-skill RAM
500GB Raid 0 HDD (2x 250GB)
AMD Athlon x2 2.8ghz sllightly overclocked to 3.1 at stock voltage (tried bringing back to stock and no difference)
ASRock A780 motherboard