I have a couple suggestions.
Vector has the ability to set-up your nvidia driver during installation. Since you are still working from a new install you would not be losing much if you simply reinstall Vector and let it do the driver set up for you. You would simply skip the partitioning part of the install since you have finally got that where you want to. Also since you have chosen a home partition during your original set up just make sure you do not format it the second time around and it will be left unchanged.
2nd option
I think you can run the autosetup hardware function of VASM.
log out.
Instead of logging in normally click System and choose Console login.
at the login prompt type root
enter your root password
vasm
(VASM application will launch)
Choose autosetup and follow the prompts.
Third option
Go to this page
http://www.nvidia.com/Download/index.aspx?lang=en-usand use the drop down menu to select the driver right for you.
Download that driver to your home directory.
log out.
Instead of logging in normally click System and choose Console login.
at the login prompt type root
enter your root password
cd //home/yourusername
sh NV (hit the tab key. The NVIDIA file name should automatically fill in. When it does hit the enter key.)
Then just follow the nvidia installation prompts. Say ok to everything.