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I'm currently having an issue with playing Minecraft. I played Minecraft perfectly before I had an issue with my computer. Now when I open the minecraft.exe file (or try to open Java itself from the start menu) it says there is a problem with Java:

The registry refers to a non-existent Java Runtime Environment installation or the runtime is corrupted. The system cannot find the path specified

I re-installed Java but it seems there is a problem with my windows installer:

"Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor."

I tried to reinstall the Windows Installation service however this says there is not enough space (even though I have about 12GB free on my hard drive). I'm not sure if this is the correct file I'm trying to install but I thought it was worth a shot.

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Try renaming the .exe to a .jar People are having this same issue and this seems to solve it.

Once you've tried that, remove every instance of Java you have and reinstall with a package from Java's website. Make sure it's the right architecture (32-64 bit). Try removing Java with the Windows Cleanup Utility, then reboot, the reinstall.

EDIT: Come to think of it, back when I ran windows a similar thing happened to me. Try upgrading to the latest version of Windows Installer. If you're already at the latest, try reinstalling.

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I feel the problem may be deeper with Java as .jar files aren't even associated with Java anymore (it doesn't know what to open them with). Any ideas? – Leon Apr 11 '11 at 11:17
I just edited my answer, try that. If not, we'll keep looking. – MaxMackie Apr 11 '11 at 11:18
Trying to install the Windows Installer redist gives the error "Not enough storage is available to process this command". As for uninstalling Java via the Windows Cleanup Utility, the uninstall worked and I'm trying to reinstall Java now (just at the bit where it usually errors - we'll see). – Leon Apr 11 '11 at 11:26
Alright let's hope you don't encounter errors – MaxMackie Apr 11 '11 at 11:29
Unfortunately when trying to install Java, it thinks it already has it installed. I click reinstall but then it says "This action is only valid for products that are currently installed". It's really just smacking itself in the face. Any ideas? (Just restarted - still have the same problem) – Leon Apr 11 '11 at 11:34
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