Debian Wheezy: startx doesn't exist among other things

I am running Debian Wheezy with Nvidia graphics card. Currently after booting up, the GUI doesn't start.

I have already installed nvidia driver:

wiki.debian (dot) org/NvidiaGraphicsDrivers#Debian_7_.22Wheezy.22

with the proper configuration:

wiki.debian (dot) org/NvidiaGraphicsDrivers#configure

When looking at the suggestions here:

linuxquestions (dot) org/questions/debian-26/debian-wheezy-fails-to-boot-into-gui-after-post-881164/ someone recommends checking out /var/log/Xorg.0.log

The results of grep EE /var/log/Xorg.0.log are:

[ 335.014] (EE) [drm] No DRICreatePCIBusID symbol [ 335.051] (EE) open /dev/fb0: No such file or directory

When researching only one other chap seems to have posted such an issue: forums.debian (dot) net/viewtopic.php?t=56478 But his solution was not particularly helpful to me. (Perhaps I just don't understand how to apply it, but I'm pretty sure what he did to fix his issue won't fix mine).

I think I can describe how I got into this predicament.

When I run applications in Wine (version 1.4.1), there is no sound (and the test sound doesn't work on the winecfg audio tab). The driver it is using is ALSA, and my audio card is an Asus Xonar STX.

It looks like there is a bug with Wine that doesn't permit sound to work so I tried to install Wine 1.7 with instructions here: http://ift.tt/13mv5fu (Scroll down to "Installing latest Wine" section).

Everything is groovy until around

# gdebi libwine-*

Then I was getting this message: The following packages have unmet dependencies: ... Depends: libc6 (>=2.17)

Note the comments of the very page I was reading instructions from has comments about unmet dependencies.

Reading more and more online it looked from cases of Ubuntu users having this issue it had to do with outdated or no longer supported software. Which led me here: How to upgrade glibc from version 2.13 to 2.15 on Debian?

Now, this is truly where I think the shit hit the fan.

I followed every instruction given by 0E 800's answer but one: IMPORTANT You need to exit out of your display manager by pressing CTRL-ALT-F1. Then you can stop x (slim) with sudo /etc/init.d/slim stop

After reboot, my GUI is dead and doesn't start on boot.

So I followed instruction, went into source.list and removed the sid line (deb http://ift.tt/jjUy6D sid main) and did an apt-get update thinking this would sort of revert or re-pull packages. To no avail, and there was some comment about apt-get autoremove. I ran this command, and once complete everything looked to be in order (no messages or issues with apt-get update outside of the norm).

So I rebooted expecting things to be better (how foolish, I know).

So I have myself in a bit of a predicament. Not sure how to fix it this time. Please, Debian and Linux masters out there- heed my cried venez m'aider, s'il vous plaît

First, I apologize for being foolish enough to end up in this predicament. Second, I must apologize for the links above which are non-standard format. I don't have the reputation to post more than two links, but leaving them out would not only make me look like I haven't attempted to solve this already but would make this post less meaningful to those who may help me. Third, thank you for reading, even if you don't have a solution, I welcome comments and warning.