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On my Media Center PC, after reinstalling some video codecs, my MKV* video files made Windows Explorer crash regularly when opening a folder with one of these files in it. To solve this problem, I had to disable automatic thumbnail generation in Vista or Windows 7. Disabling thumbnail preview in Windows Explorer can make Vista/Windows 7 perform notably faster in any case, as Explorer will no longer be generating thumbnails for every video and image file in every folder you open. This is especially useful when browsing back and forth between multiple folders. Follow these steps to disable the automatic thumbnail generation:

1. Press and hold the Windows key on your keyboard, then press E to open Windows Explorer (alternatively click Start > Accessories > Windows Explorer).
2. In the Windows Explorer window, click on the Organize button on the menu/shortcut bar.
3. In the pull down menu, click on Folder and Search Options.
4. The Folder Options dialog window will appear. Click on the View tab.
5. Under the Files and Folders tree heading, check (tick) the box next to Always show icons, never thumbnails option.
6. Click the OK button and you’re good to go!

* MKV is a common container format for video, audio and subtitles, often used to distribute standard and high definition video, audio and associated subtitles in one single file, with support for multiple audio and subtitle tracks, just like on a DVD.

Edit: Some newer codec packs, such as the Shark007 Codec Pack, by default turns off MKV thumbnails, but also makes it possible to easily control this and MANY other settings through an easy to use Windows application interface.

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To be able to access administrative shares and shut it down remotely, I added another user to my media center computer (HTPC) matching my usual username and password. Upon next boot, I discovered that instead of being logged on automatically, I was now presented with a logon screen, where I had to choose between the default (passwordless) user and my newly created “remote control” account.

“There’s got to be a way to get the automatic logon back”, I thought. Of course there is! Following is the simple solution to configure automatic logon in Windows 7 or Vista. (Please bare with me, and pretend that the Norwegian screenshots are in English for now.)

1. Click the Start button and and type in “netplwiz” into the search field on the bottom, and hit Enter.

   
   

2. If you’re prompted by User Account Control, click “Continue”. The User Accounts window should appear now. Select the user that you want to log on automatically on startup, then untick the box next to “Users must enter a username and password to use this computer”.

   

3. Click “OK”. You will get prompted to enter your password twice.

   

4. Reboot and you will be logged on automatically!

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How do you enable remote access to admin shares using a local administrator account in Windows 7 / Vista?

When you try to do this the same way you could in XP, you get prompted to log in, but get access denied. Apparently, for “security reasons” this option has been disabled. Thankfully, a small registry hack is all it takes to get around the issue:

1. Open regedit (<Windows> + R, type “regedit”).
2. Expand the tree to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft\ Windows \ CurrentVersion \ policies \ system.
3. Create a new key (Right click -> New -> choose “DWORD Value (32bit)”).
4. Name the key “LocalAccountTokenFilterPolicy” and give it the value of “1″.
5. Click OK.