How do I reset it Acer aspire laptop if I can't read the homepage when I'm turns on because it's in Japanese.

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All laptops have a CMOS, or "Complementary Metal Oxide Semiconductor," battery.
The main purpose for the CMOS battery is to keep the system time, date and BIOS settings even if the computer is turned off or the main battery dies.
Individual Acer Aspire laptop models differ somewhat, but the general steps are the same when replacing a dead CMOS battery.Preparation

Read through the owner's manual for your particular Acer Aspire laptop to determine what kind of CMOS battery you need.
Purchase the battery through Acer or a local or online computer parts dealer.
Turn the laptop off and unplug it.
Also unplug any external hard drives, cameras or other external devices.
Turn the laptop over (bottom facing up), then touch something metal to remove static charge.
Removal
Remove the Phillips screws that secure the motherboard cover (refer to your owner's manual if necessary), then release the cover from the clips on the bottom of the plastic casing.
Lay the cover aside, then locate the CMOS battery cable on the right side of the motherboard. Unplug the cable, then remove the battery.
Installation
Plug the new CMOS battery cable into the motherboard.
Slide the battery partially under the laptop casing to hold it in place, then align the cover with the slots on the bottom of the laptop housing.
Replace the screws, then turn the laptop back over.
Settings
Plug the laptop in and turn it on.
Enter your BIOS (usually by pressing "F1," "F2," F10" or the "Delete" key) before the operating system loads.
Follow the BIOS prompts or refer to your Acer Aspire owner's manual to reset your time, date and desired system settings.
BIOS Reset
Any time the CMOS battery is unplugged for more than a few seconds, your BIOS will be reset to the default manufacturer settings.
If you make any changes to the BIOS that cause problems with your Acer Aspire, unplug the CMOS battery for 3-5 seconds to correct the problem.
http://support.acer.com/us/en/default.aspx


Acer aspire laptop battery replacement
http://www.youtube.com/watch?v=mQTZ1AUR0uw

Reset ACER Aspire 3610 BIOS Password - Only 8 Steps

Hi:
Your Acer is a model that was able to be marketed in either the United States or Japan. If it was sold in Japan, the Operating system would be in Japanese as well.

Try to search the driver in google, or in the acer website.

If you are running windows, you can open up your control pannel (in classic mode...easier) then double click the icon named "Regional and Language options" (Which if your OS is in Japanese and can't understand the words, it's the icon with the picture of the world, and a clock.) Double click on that icon, then the first drop down menu has all the languages your OS supports.

read this article: http://en.kioskea.net/faq/sujet-2040-acer-pc-restore-to-factory-settings#copy-the-acer-factory-default-backup-disk-image

Hope this helped! ^_^ have a great day

try to press and hold the power button until the unit turns off. usually bout 7 to 10 seconds.

then turn it back on...

try going to internet options and go to advanced go to bottom of the page restore or reset internet explorer this show fix the promblem ...

Please visit the below mentioned link to download Windows XP drivers for your laptop:

Acer Aspire 5220 drivers for Windows XP

Thank You