Why does this site trigger a DEP error using Firefox 3 and Vista x64?

Turn off DEP for your browsers. I had to turn off DEP for someone at my office, they were getting Excel errors. I tried looking for a patch or fix for the error (other than reimaging the computer), and in the end decided just to turn off DEP.

For websites and browsers, you should be ok turning off DEP as long as you browse responsibly and have an anti virus program.

Below is from the Windows help file on DEP.
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To open System Properties, click Start, click Control Panel, and then double-click System.

1) Click the Advanced tab and, under Performance, click Settings.
2) Click the Data Execution Prevention tab.
3) In the Turn on DEP for all programs and services except those I select list, do one of the following: To turn off DEP for a program, select the check box next to the program name and click OK. (If the name of the program doesn't appear in the list, click Add, navigate to your Program Files folder, select the program's executable file which will have an. Exe file extension, and click OK).
– or –

To turn on DEP for a program, clear the check box next to the program name, and then click OK.