ed, windows installer will ask you where you’d like to install Windows XP to: follow the prompts to delete all the current partitions, then follow the prompts to create a new partition, and install Windows XP to that. You can chose the “Quick Format” to speed things up.
Follow the rest of the prompts to windows in the usual fashion.
Next, use the following drivers to get all your hardware set up, since Acer is providing only Vista support on this notebook so far.
We recommend installing drivers in this order:

1.    Realtek HD Audio Driver
2.    Intel Chipset Driver
3.    Intel Graphics Driver
4.    Atheros WiFi Driver
5.    Broadcom Ethernet Driver
6.    Launch Manager
7.    Touchpad Driver
8.    Acer Empowering Framework
9.    Acer ePower Management
Alternatively, you can download all of these (except for the last three) at once in a single 46MB zip file. Remember that these are specific to the Acer Aspire 5315.
The Broadcom drivers must be installed through the device manager, the rest have installation executables which should be used. Sometimes you have to have windows “Update Driver” on an unknown PCI device in order to get the Realtek to work.
We have a working modem driver. Check out the separate tutorial on getting it up and running (should be installed last).

Modifying the BIOS Settings

Shut the notebook completely down. Now turn it back on, and as soon