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Hope this helps some people!!!

Downgrade your Compaq Presario C700T from Vista to XP.

Step 1) create recovery discs

Step 2) Compaq Presario C700T has a SATA Hard Drive.
Windows XP does not contain the SATA drivers. So, you need to disable the SATA and try to install the Window XP.
Here are the instructions to disable the SATA:
1. Restart the computer and start tapping F10 key
2. Choose System Configuration tab.
3. Disable SATA native support.
4. Save and Exit the BIOS by pressing F10 key.

Step 3 ) Drivers - Here are the drivers for C700 Model with an Intel Processor.

Download all the driver and burn to a CD. Then use the CD to install the drivers after XP is installed.

Do not link these....copy and paste into browser.

Video
http://downloadmirror.intel.com/14388/a08/win2k_xp14311.exe

Chipset
http://downloadmirror.intel.com/13799/eng/ChipUtil.exe

Realtek RTL8100CL/RTL8110Sb NIC Driver
ftp://ftp.HP.com/pub/softpaq/sp30001-30500/sp30156.exe

Intel Pro Wireless
ftp://ftp.HP.com/pub/softpaq/sp33001-33500/sp33404.exe

BroadCom Wireless
ftp://ftp.HP.com/pub/softpaq/sp32001-32500/sp32156.exe

ALPS Touchpad Pointing Device Driver
ftp://ftp.HP.com/pub/softpaq/sp38001-38500/sp38113.exe

This model of Presario has an audio controller that supports the high definition audio. You need to have Microsoft Universal Audio Architecture (UAA) Bus Driver for High Definition
Audio installed on the computer before installing the audio driver.
Here is the link for the Microsoft Universal Audio Architecture driver that need to be installed before installing the audio driver:
ftp://ftp.HP.com/pub/softpaq/sp33501-34000/sp33867.exe


Conexant CX20549-12 High Definition Audio driver:
ftp://ftp.HP.com/pub/softpaq/sp36001-36500/sp36090.exe
* Note * Installing Audio drivers may result in an error. But continue with the following steps to get the audio driver installed correctly.
1. Click on Start and select Run. Now type devmgmt.msc and press enter.
2. Right click on "Audio device on High Definition Audio Bus" and click Update driver.
3. Select "Install from a list or specific location"
4. Click Next. Then select "Don't search, I will choose the driver to install"
5. Click Next and then select "Sound, video and game controller" from the list.
6. Click Next and then click Have Disk.
7. Click Browse C:swsetupsp36090 folder and the double click the V32 folder. Select the .inf file, click open and Continue with the onscreen instructions.

Similarly install Modem Drivers:

Conexant CX20548 Modem Driver for Microsoft Windows XP
ftp://ftp.HP.com/pub/softpaq/sp36001-36500/sp36089.exe

1. Right click on "Modem device on High Definition Audio Bus" and click Update driver.
2. Select "Install from a list or specific location"
3. Click Next. Then select "Don't search, I will choose the driver to install"
4. Click Next and then select "Modem" from the list.
5. Click Next and then click Have Disk.
6. Click Browse C:swsetupsp33890 folder and select the .inf (wis30b2b) file and click open and Continue with the onscreen instructions.

Quick Launch Button
ftp://ftp.HP.com/pub/softpaq/sp38001-38500/sp38171.exe

Refer to the below link which has detailed steps with screenshots for reformating the Hard Drive and reinstalling Windows XP:
http://www.windowsxphome.windowsreinstall.com/installxpcdoldhdd/indexfullpage.htm

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