Small Problems

OK I just bought my first car which is a 97 Kia Sephia LS, It had a boat (yes as in yacht) radio in it when I bought it. I have a Jenson CD2010X to put in it now, but everytime I try ti put it in the fuse for the dash lights blow. Any ideas? Also, recently when i run the defrost or the A/C there ends up being a puddle in the passenger floor board. My friend says the vents on the outside might be clogged with pollen and stuff and is pouring the rain water into the car. It doesn't have a sent so I am thinking it isnt anything too serious, but it is so annoying. The water mainly pours out when I turn corners. I have one other question, does anyone know of a cheap place to get a windshiled ?
Thanks
-Mandy

Make sure that the right amp fuse is in there. If it keeps blowing, go up one amp from 10 to 15, and see if that works.

I have already tried the fuse thing, I have a 20 in there now. Everything is working but the radio is still not getting power.