I'm in an apt, not sure if it's mine or not.  I go into one of the bedrooms & there's a silver looking small spider with a fat round body.  I grab a sandal to kill it & when I do that there's more under the sandal.  Try to start killing them and they just start multiplying all over the room & apt.  So I continue to try to kill them all and realize I can't & run out!

Many standard dream dictionaries say that spiders mean money luck (money spiders?). This could be why the spiders in your dream were silver coloured. Silver featured in a dream is thought by many to be an omen of plenty, but coupled with heavy responsibility.

Killing the spiders which only multiply in even greater numbers suggests that you are being presented with many opportunities to attract more money into your life, but are either unable or more likely unwilling to accept the huge responsibilities involved in having it. In a certain type of way you are uncomfortable with having more money in your life, not so much because you would not enjoy and appreciate the many benefits of some extra income, but more so because you do not feel worthy of having it.

This dream suggests to me that you need to develop what is often called a greater degree of wealth consciousness - you have just as much right as anybody else does to have some pleasures and enjoy the simple luxuries in your life if you are willing to work hard enough and for long enough in order to earn them.

Money itself is not the root of all evil. It is giving the accumulation of material wealth a much higher priority in your life over the things that are really important (your relationships with other people and your spiritual development) that can result in so much misery and suffering for all people concerned (especially yourself).

eye_of_tiger

the spider    travel, creativity  the power of touch

for four hundred million years spider has spun her exquisite multifaceted magical silk  more elastic than nylon stronger than its equivalent in steel in every conceivable environment except the central antarctic cap

she flies to remote islands and uninhabited lands on strands of silk let loose into the air reaching heights of sixteen thousand feet and journeying hundreds even thousands of miles through azure skies and dark brooding storms

if spider has chosen to guide you it is time to expand your horizons metaphorically and literally.
travel to faraway lands or aneighboring town to a wild flower meadow you have never visited before .see the world through new eyes and understand deep within that nothing is impossible. if you have alwyes longed to live in adifferent world od in a different way spider councels that the time may have come to make this dream reality.

spider sees her world through touch not light translating vibrations in air earth and web into knowledge.

she advises that you  too take wisdom from what you cannot  see and if the fleeting touch of another affects you acknowledge that connection and encourage it to flourish.

Wow, that's powerful. That image of a silver spider immediately sounded positive/lucky to me.
And check this out: http://www.csicop.org/superstition/library/spider.html
Because you said you tried to kill it, I wonder if you're doing something in your life to hold you back from having what you want?
It could be money, but honestly, I think it could be anything.  Many of us subconsciously sabotage our best efforts because somewhere in the back of our mind, we don't think we deserve it.
It sounds to me like as soon as you fix this mental block that's holding you back, you'll start getting what you really want... & a lot of it.