Having some trouble with Asus 1215N.. need help

I m having some trouble with my Asus EEE 1215N. I cant seem to be able to decrease my screen brightness. when i press Fn+F5 it shows that, brightness decreased from 100% to 90%. After that it doesnt decrease anymore. I m assuming it is because of some software related problem. Because I was having trouble with USB earlier, i uninstalled some soft that the shop installed, and it started working So i think may be screen brightness problem may be caused by some program too. So i m thinking about reinstalling OS. But if there is any alternate solution than wiping entire OS and then reinstalling from scratch i would rather take that solution.
So here are the things i need to know:

1. How do i decrease my screen brightness? ( Fn+F5 not working )
2. If i want to reinstall Win 7 Ultimate/Home premium, How do i do it? ( since DVD-ROM is USB connected, the USB drivers would probably get deleted when I format current OS. ) [Currently i have win & professional 32-bit]
3. I installed Nvidia driver 270.61 which i downloaded from there website, but Nvidia control panel isn't working. It says I dont have Nvidia GPU connected =_="

P.S. sorry for writing too much.

 

I've reinstalled W7 ultimate on my Eee 10" netbook by USB, here are the instructions I used the first time:
Use a USB Key to Install Windows 7?Even on a Netbook

You might also be interested in checking out YUMI:
YUMI - Multiboot USB Creator (Windows) | USB Pen Drive Linux

I recently just used it to make a multi-os bootable USB drive, with windows 7, a couple linux distros, and some other bootable diagnostic tools.

As for the brightness thing, I don't know, I've never had that problem on mine before.

 

Thanks for the link. I m gonna try to make a USB installer n try to install 64-bit windows 7 ultimate. May be the problems will be solved. Updating result later.

 

Don't forget to check your processor will work with 64-bit. I tried at first to install 64-bit on my 1005HA, and it said "Nope."

Here's how to check, just in case you aren't sure:

From: 32-bit and 64-bit Windows: frequently asked questions

 

Cant find if it can support 64-bit or not... the steps mentioned arent bringing the destination it supposeto bring. anyway, even if i make a USB installer, when i will format the C drive wont it also delete USB driver, rendering USB devices unrecognizable?

If there is a way to keep the USB ports working even after format then I can use my USB DVD-ROM to install windows 7.

 

Negative, the motherboard BIOS has its own firmware drivers for the USB ports, the drivers for the flash drives themselves are irrelevant. If you've booted from a CD or DVD, then you'll have seen that the optical drive(s) still work, even if you've already formatted the hard drive and subsequently deleted the windows driver for it.

 

damn it.. still not working... xD

USB DVD-ROM can read the DVD i bought from shop.. where as it is running good on any other DVD-ROM. Tried the USB Flash drive method.. but for some reason it is not booting from there xD

 

You need to install the KB Filter Utility. It is under Windows 7 (not 64-bit) Under the utilities section. Don't worry about it not being 64-bit. It will yell at you and not let you install if you use the AsusSetup.exe, use the HotkeySevice_1.23.exe installer inside the HotkeyService folder.

Heres the link Drivers