To run Knight Online using Windows Vista: (or 7)
1. Go to the Directory that you have installed Knight Online in (default C:\Program
Files\Knight Online)
2. Find the following .exe files: Launcher.exe and KnightOnline.exe. Right click each
application and select Properties from the drop down...
3. Select the Compatibility tab.
4. Select "Run this program in compatibility mode for: Windows XP (Service Pack 2)"
5. Also select the box "Run this program as an administrator."
6. Select OK.
--------------
Can I run Knight Online if I'm using Vista?
To run Knight Online using Windows Vista:
While Microsoft's Vista is not officially supported by Knight Online, it is possible to run the game if you have this operating system. To do so please follow the steps below:
* Make sure you've upgraded to the latest service pack from Microsoft. You can get
most updates to your operating system at the official site here
http: //www.microsoft.com/windows/default.aspx?icid=winvan
* Make sure to install the game when running under your administrator
account.
* Once installed, right click on the Knight Online Launcher.
* Click on ?run the game as administrator?
If after following these steps you are unable to run the game successfully, please visit the official forums here.
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You never said what the error was, either. 
Compatibility Mode
I've tried compatibility mode; it doesn't seem to have a noticeable effect. The programs still run/launch with about the same frequency whether I am in compatibility mode for XP SP2, SP3, or Vista.
Here's the output of a crash of the "Main" program.
___________________
Problem signature:
Problem Event Name: APPCRASH
Application Name: KnightOnLine.exe
Application Version: 2.3.11.1718
Application Timestamp: 4bfb61d3
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 02df1ac8
OS Version: 6.1.7600.2.0.0.256.48
Locale I
1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad1**35b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad1**35b953a78882e789
--------------------
Heres the error report from the "Update" or "Launcher" program. Incidentally, the first time I double-clicked it, it ran fine. I closed it out, waited a minute, then double-clicked it again, and it brought up the error for me. How accommodating of it.....
Problem signature:
Problem Event Name: APPCRASH
Application Name: Launcher.exe_Launcher 응용 프로그램
Application Version: 1.0.0.1
Application Timestamp: 48fd7fcb
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 027e1ac8
OS Version: 6.1.7600.2.0.0.256.48
Locale I 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad1**35b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad1**35b953a78882e789
Program starts sometimes, won't start others. No pattern that I can see...
This program requires a two-stage start; launch the "Launcher," and it checks for updates, and then gives you the option to start the "Main" program. If you attempt to start the "Main" program manually, it tells you to use Launcher.
So, I try to run the Launcher; it gives me an error, and quits. I try to run as Admin. I try with different compatibility settings. I turn off compatibility settings. Eventually, it works; usually through simply "Run as Admin" in the right-click menu, even AFTER I've tried that before, in all the various compatibility settings.
So, the Launcher runs, checks for updates, then tries to launch the Main program; and now the Main program fails, and it closes. Now, when I try to run the Launcher again, it repeats it's prior behavior, and I spend ten minutes screwing with the settings before it randomly decides that it's going to work, always on a combination of settings that failed not 5 minutes prior.
Now, seeing how the two programs have like a 5% success rate individually, it's nearly impossible to get them both to run simultaneously. So, I WAS able to create a shortcut to the Main program, so that it will run without the Launcher. I still have to get the Launcher to run periodically to check for program updates, but updates are infrequent, so I'll very rarely end up trying to connect with an outdated version of the program.
What really gets me is the lack of a pattern in all of this; settings that work one time will not work 10 minutes later, and settings that failed will suddenly cause success 5 minutes afterwards.
In addition, my girlfriend is able to run the same program on her laptop, (Windows 7 Home, or Home Premium,) without a single issue what so ever. We installed from the same .exe, and hers runs without a hitch every single time, while mine behaves just as described on both my desktop, (specs below,) and in a test run on my laptop. (Lenovo X61, Core Duo 1.8, 3g ram.)
Any ideas would be appreciated, either as to how to fix it, or just about why it might be happening. Also any information about people who have had similar issues might help.
I'm not even incredibly worried about finding a solution to this, so much as I'm just frustrated by the seeming lack of a pattern to the errors. I CAN get it to work, with a couple of minutes of trial and error each time, but I'd like to know what's causing the error, more from an educational standpoint than anything else.
Thanks in advance for all your help.
Adam
System Specs - Intel Core Duo 2.2, 3g RAM, Nvidia-based 9500GT graphics, Windows 7 Pro.
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