Ok this is my short vague guide on how to install vector without a cdrom or floppy or usb. Due this at your own risk. I doubt there is any but whatever.
use it to install the vector iso on your widows c drive
then you need to make another partition probably with another linux distribution formatted as ext2. just big enough for the ISO.
copy the iso to the partition restart to windows and while booting it should have a unetbootin option that will boot vector and allow you to install.
If you need another distro to make the partition you can use unetbootin to install one. unetbootin will allow you to boot into ubuntu live or similar pretty easy.
I'm sure this was unclear and i'l come back to answer questions. If someone understands they could put it in the wiki or something.
Basically what unetbootin does is installs a linux iso to your windows partition and allows you to boot to it. This works for vector linux but when vector linux starts the install, at least for the light version, it cannot find the install media which is why you need to place the iso on its own linux partition.
This should probably been posted in the howto section.