"There was an error during startup, please see the log for more details" So much rage.[SOLVED]

Alright, so a couple of months ago my Sims launcher started displaying the above message whenever I tried to start it. Being the busy bee I was, I attempted a quick fix by uninstalling and reinstalling my games onto the second of two "Local Disk Drives" on my laptop (D:). This, sadly, didn't work, so I gave up and haven't played it since. I'm now less of a busy bee, so I dedicated the whole day today trying to find the source of the error message.
So, here's what I have done today!
- Uninstalled/reinstalled the base game again
- Manually installed the most recent patch from the Sims 3 website
- Deleted leftover files using regedit
- Reinstalled a couple of my expansions (Purchased and Downloaded)
- Checked that all my drivers were up to date, the usual closing background tasks and such that EA tells you to do but never works
- Moved the D:My Documents/Electronic Arts/The Sims 3 folder to my Desktop and tried to launch it from there, also tried starting the game manually, without the Launcher
- Someone on thesims3.com forum suggested I remove the resource.cfg file then uninstall/reinstall my purchased game.

None of it worked. I've been relentlessly searching around for an alternative solution but I don't think I can find one. My next step was going to be uninstalling it all and just downloading a new base game from you guys.
So, I'm literally on my knees (Well, you wouldn't know), does anyone have a solution? Insert epic sadface.

Three times I believe.

Yeah I did do that.
The message is "Unable to start game, Service initialization failed (0x0175dcbb)

Hello,

That error is normal when you try to bypass with a "Error during startup."
Did you rename, remove or move any of the files or folders in: C:\Program Files (x86)\Electronic Arts\ in any way?

No I did not, should I have?

/EDIT

I uninstalled all of them again, and reinstalled on C: just in case that
was the problem, same thing occurred. I'll be downloading your version
of the base game tomorrow, see if that works!

Hello,

Which version of the base game did you use first?

Hello,

That's why I asked, because some (modified?) base games do tend to mess with the Registry, as I discovered via TeamViewer a few days ago.

ALRIGHT! /Deep breath
I uninstalled everything, deleted any sim related files and used regedit again, reinstalled them all and applied the crack for Katy Perry's sweet treats.
Laucher - check,
Game starts - check,

Freezes at the end of the load screen. :C
Also, as I open the actual game it has a 'unofficial game modification' warning that advises me to uninstall these game modifications or get updated versions of them. Thought this might be relevant.

/sigh

//EDIT

AHA!!! SIMS 3 ULTIMATE FIX WORKS!!
You guys are honestly the greatest people that ever lived.
Games4theworld for president... s.
Thankyou ever so much!