Java Help Needed!

[Beeze23]

I do recall having had some issues with older versions of Java installing updates in a way that eventually broke everything -- I've come to the conclusion that trusting the updater is just asking for trouble.

You want to have Java 7, where update 65 seems to be the latest. First uninstall any other Java showing up in Programs and Features, to try to prevent the old ones from sticking around, then grab the right download from that link I just posted (probably Windows x64, unless you're pretty sure you're on a 32-bit machine).

After uninstalling all Java via Add/Remove programs, also nuke all traces of it before trying to reinstall current Java.

It's easiest just to search the C:\ drive for Java, it can shotgun itself all over the place. It's never had the cleanest install/uninstall. Look for folders named "Java"

C:\Users\[username]\AppData\LocalLow\Sun\Java
C:\Users\[username]\AppData\Roaming\Oracle\Java
C:\ProgramData\Sun\Java
C:\ProgramData\Oracle\Java
C:\Program Files (x86)\Common Files\Java
C:\Program Files\Java
C:\Program Files (x86)\Java

Etc,etc,etc.

Make sure "hidden" files and folders are shown.
[username] is your Windows user name
You don't want to remove the Java folders in Adobe, OpenOffice, or LibreOffice directories (if you have those installed) .

Download page for full install versions: https://www.java.com/en/download/manual.jsp

I have both 32 and 64bit versions installed without issues (I need both), just make sure the FTB launcher is using the 64bit one.
Options -> Advanced Options, path should be C:\Program Files\Java\jre7\bin\javaw.exe NOT C:\Program Files (x86)\Java\jre7\bin\javaw.exe (Unless you only have a 32bit OS)

 

[LazyChocolate]

Okay, all these instructions are melting my face, but I am going to do what Narc and Beeze23 said, and if it doesn't work, there's a nice high bridge near where I live...

 

[LazyChocolate]

Exciting new update!
On the programmes list, I have two copies of Java:
Java 7 Update 51 (64-bit)
Java 7 Update 5 ([64/32] not specified).

The first one uninstalled fine.
However, when the second one is about to be finished uninstalling, the green progress bar reverts to the start and it closes.
(For the record, I tried installing the [64/32-bit] unspecified Java first, and then second, both actions ending with the same outcome).

I am going to proceed to install Java 7 \update 60-whatever now anyway.[DOUBLEPOST=1405594129][/DOUBLEPOST]

You want to have Java 7, where update 65 seems to be the latest.

The "SE development kit"?

The other stuff you say you've had happen completely befuddles me, and I have no idea what you did there.

I accidentally launched the outdated Minecraft launcher xD

**UPDATE** It worked nevertheless! Hooray! Let's just hope nothing else happens...
Thanks for the help, everybody! If I need help with anything else involving my FTB launcher, I will post it here.

 

[Hambeau]

Exciting new update!
On the programmes list, I have two copies of Java:
Java 7 Update 51 (64-bit)
Java 7 Update 5 ([64/32] not specified).

The first one uninstalled fine.
However, when the second one is about to be finished uninstalling, the green progress bar reverts to the start and it closes.
(For the record, I tried installing the [64/32-bit] unspecified Java first, and then second, both actions ending with the same outcome).

I am going to proceed to install Java 7 \update 60-whatever now anyway.[DOUBLEPOST=1405594129][/DOUBLEPOST]
The "SE development kit"?

I accidentally launched the outdated Minecraft launcher xD

**UPDATE** It worked nevertheless! Hooray! Let's just hope nothing else happens...
Thanks for the help, everybody! If I need help with anything else involving my FTB launcher, I will post it here.

Congratz! May I also suggest in the future that you only load Minecraft from Mojang directly and FtB directly from here? I know there have been MC versions distributed from questionable sources in the past that have been 'less than healthy' for your hardware and it's usually safer (and quicker) to get up-to-date versions directly from the source.