What...What?...WHAT??

[=sw=warlord]

Someone explain this.

[Timo]

Did you previously fail to install Crysis at one point :?

[Kornman00]

Have you installed Crysis recently?

[annihilation]

Restart you computer and try it again.
This usually happens when you setup something that prompts you to restart your computer but you don't restart and install something else.

or

You may have something left in your registry. Try cleaning it.

[=sw=warlord]

Have you installed Crysis recently?

Nope, been installed for ages.
I installed H2V just before trying the editor with no issues.

[Resinball]

Reinstall Crysis? Or reinstall it, restart then uninstall it.

Run CCleaner: http://www.piriform.com/ccleaner, but be careful what you remove. If you have experience with Regedit then you may just want to search for the remaining Crysis references manually.

[supersniper]

lol wtf? why would crysis even have anything to do with halo2vista?
retard error.

[Higuy]

Are you running Sandbox or any other Crysis app's while installing?

[=sw=warlord]

Are you running Sandbox or any other Crysis app's while installing?

Nope.