Reinstalled Windows 7, now nothing works... help

My father-in-law was having some trouble with his pc, so he decided to reinstall his OS. Now nothing works; we have bare-bones OS with no connectivity to anything. I believe he may have completely reformatted his hard drive, possibly deleting some system files? We can't even connect to the internet, looks like the network adapter no longer has a driver installed.
I know my way around a pc, but I confess to being a little out of my depth. Any advice would be appreciated

Hi:
No doubt the PC is missing several key drivers for the hardware.
The devices needing drivers will be listed in the device manager under an Other Devices category and they will all have little ! marks next to them.
One of them is probably the ethernet controller.
You need this driver for that so you can connect to the internet by wire.
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=cp-95742-1&cc=us&dlc=en&lc=en&...
You will find the rest of the drivers you need at the link below.
Most of them will be under the Original Drivers category.
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=4063&lc=en&cc=us&dlc=en&sw_lang=&product=5115...

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