gpu doesn't show in device manager; network card driver install fail

well, my brother's hdd in his laptop was going bad, it kept failing to boot. so i replaced it with another one. when i turned the laptop back on it started installing all the drivers for his hardware (windows was already installed on the 2nd hdd) and prompted me to reboot. after i did windows failed to start several times. i re-installed windows from scratch, and now his graphics card isn't showing up in device manager and windows cant find a driver for the network or ethernet card.

his specs:
gateway
windows 7 professional x64
ati mobility radeon hd 4250
broadcom bcm943225hm (network card)
amd phenom II x4 n9790
4gb ddr3

update:

so, i got it to install the driver for the network adapter, but when i search for an access point, i cant see my wireless, in device manager it has "ethernet controller" listed under "other devices" with one of the ! inside an orange triangle