Is this version too much for my hardware?
On the face of it - no.
A Google search using keywords (you can use this with any Linux Distro) "ubuntu 14.04 system requirements" shows, at
The Recommended Minimum System Requirements, here, should allow even someone fairly new to installing Ubuntu or Gnu&Linux to easily install a usable system with enough room to be comfortable. A good "rule of thumb" is that machines that could run XP, Vista, Windows 7 or x86 OS X will almost always be a lot faster with Ubuntu even if they are lower-spec than described below. Simply try Ubuntu CD as a LiveCD first to check the hardware works.
Ubuntu Desktop Edition
... so your system easily covers that.
Graphics issues with nVidia drivers can plague Linux users from time to time, myself included.
Your very simplest option, at first, might be to check and see if the homegrown Nouveau driver works as a replacement for your nVidia. The following screenshots are from my install of Vinux 5.0 (Vinux is for the visually challenged) which is based on Ubuntu 14.04 LTS, featuring the Unity launcher at left (I assume you are using Unity).
Go to the Dash, top left-hand corner and click, type in Additional, then click Additional Drivers.
Yours should show your Nvidia GeForce FX5500 video driver highlighted as in use. But you should also see the option for Nouveau, such as I am using. Note also the tab second from left reads "Other Software" - we can look at that shortly.
In your case, if you check and choose the Nouveau, the Apply Changes button will highlight, click it. It may take a minute or two, and you may see a progress indicator. When the process is complete, close out and reboot and see how you do.
If no better, or even worse, you can retrace the steps and choose Revert, wait for the changes, and reboot, you'll be back at square one.
Other Software tab, mentioned earlier is handy for seeing what ppa's you have
from Wikipedia - A Personal Package Archive (PPA) is a special software repository for uploading source packages to be built and published as an APT repository by Launchpad. While the term is used exclusively within Ubuntu, Launchpad host Canonical envisions adoption beyond the Ubuntu community.
Mine here is from Vinux
... and what is NOT listed there is a part of my next option:
CLI option, ie from Terminal:
NickAu has an excellent article here -
... which is well worth the read. If you read through the 3 or so pages, you will see where I am going, and it includes some happy input from me.
In #2 of that Topic, Nick gives instructions on adding a PPA to your system. My screenshot below is from my Ubuntu 15.10 MATE "Wily Werewolf" from which I am now typing
... and you can see at bottom the result of following that Terminal process Nick outlines - xorg-edgers is now there.
In my Ubuntu Wily you can see that as a result, I am using nVidia v358.16 successfully
If you take a look at http://www.howopensource.com/2012/10/install-nvidia-geforce-driver-in-ubuntu-12-10-12-04-using-ppa/ and scroll down the page to Quadro FX Series, you will find your card listed there.
I hope one of these options work for you, and are not too confusing, but if so come back and we can take a look. There is more than one way to skin a cat, and if you persevere I am sure you will soon be on your way in your Linux adventure.
I would certainly advocate trying the Nouveau option first, as it may be your one-stop shop for now and the immediate future.
Keep us posted and good luck.
BTW - and to the Linux Section if this is your first time here!