My compaq presario c700 laptop didnt shows the inbuilt webcam and it also shows a unknown Microsoft ACPI-Compliant System hardware. what i do

the charger plug?
if the notebook does not indicate that the battery is charging, it's might be that the battery itself is operating correctly, but its power management software may have become corrupt or troubled. In order to correct the problem, you will need to uninstall and reinstall the power management software by using the Device Manager
To correct the battery's power management software, follow the steps below.
1. Click Start and type device in the search field, then select Device Manager .or right click on My Computer,select properties,click Hardware tab,click Device Manager
2. Expand the Batteries category.
3. Under the Batteries category, right-click the Microsoft ACPI Compliant Control Method Battery listing, and select Uninstall .
WARNING: Do not remove the Microsoft AC Adapter driver or any other ACPI compliant driver.
4. On the Device Manager taskbar, click Scan for hardware changes

the charger plug?
if the notebook does not indicate that the battery is charging, it's might be that the battery itself is operating correctly, but its power management software may have become corrupt or troubled. In order to correct the problem, you will need to uninstall and reinstall the power management software by using the Device Manager
To correct the battery's power management software, follow the steps below.
1. Click Start and type device in the search field, then select Device Manager .or right click on My Computer,select properties,click Hardware tab,click Device Manager
2. Expand the Batteries category.
3. Under the Batteries category, right-click the Microsoft ACPI Compliant Control Method Battery listing, and select Uninstall .
WARNING: Do not remove the Microsoft AC Adapter driver or any other ACPI compliant driver.
4. On the Device Manager taskbar, click Scan for hardware changes

Ok, there are NONE, for Win 7. You may be able to get it to work like this, go to device manager, locate the Unknown Web cam.. and search for the driver online...it may find it otherwise...

You can use camera which can be connected using USB port, you will just need to install its software and drivers.

At first let me tell you should have Operating System Vista for the inbuilt mic to work to get the full performance as it has the drivers. Got to Start>All Programs>Accessories>Entertainmnet>Sound Recorder. You can check the mic is working or not.
Regards

You cant upgrade the inbuilt webcam.for that you can buy a external camera and connect it through usb

i have compaq Presario c700 laptop
but my external microphone is not working & also inbuilt microphone is not working.

i think you can download this at hp.com website..

Follow this link, it tells what you need to do in order to get the HD audio drivers on the Compaq C700 models.
http://forums12.itrc.hp.com/service/forums/bizsupport/questionanswer.do?admit=109447627+1217003491117+28353475&threadId=1197782

The wireless is not going to turn on and off via the switch properly until we get the drivers loaded to make it work. There are 3 possible types of wireless card it could be, so we have to find out the exact model number of your system. On the bottom there should be a label that has a P/N or part number listed. what are those numbers. Here's an example of the label:

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00033108&lc=en&cc=us&lang=en&os=2093&product=3632144&dlc=en

or

http://tinyurl.com/35dt4h

we need the info listed for #1, #2 and #3. Then we should be able to determine which adapter you have, and then we can (hopefully) find some Windows XP drivers for you.