I set a password by mistake now I can access my tablet. I don't know what that password is. How do I access my tablet now

You can go into the settings menu and do a factory reset. This is the easiest way however you will lose any and all data on the tablet including any pictures, contacts, etc. The other way is a little more complicated. You would need to access the settings> account menu. Add your own email account then delete hers. I assume you mean a password to lock the tablet. That would be under settings> security. You will need her password to enter then you should be prompted to enter a new password twice.

No password, no access. You seem to need to 'Restore iPad' through iTunes (connect iPad to computer and open iTunes, you need internet connection to download system). All data will be lost through a restore, unless you back up (but without password you probably don't access the data anyway...).

Firstly Check if your WIFI router is working by accessing the WIFI connection from another computer, tablet or phone.

If it does, then use the same WiFi connection settings that it has on your ARCHOS.

You could also try connecting your ARCHOS to a friend's WiFi network and if this works, change your access point parameters to similar ones.

OTHER TROUBLESHOOTING OPTIONS:
1. Check your WiFi router/modem documentation to see if it has a pairing button that needs to be pressed. Some modems have such a button that must be pressed the very first time you try to make a WiFi connection with a new device.

2. If you have to enter a password (a security code of type WEP or WPA) be very careful that you do not confuse a 1 and I (one and letter "I"), a 0 and O (zero and letter "O"), or U and V. These are common mistakes.

3. When entering a security code for your WiFi access, check the box "Show Password" which will allow you to see exactly what you are typing in. This will avoid any mistakes.

4. Some access points use what is known as MAC filtering. That means, the WiFi access point has a list of access numbers (every hardware device has a unique MAC number) which are the only ones allowed to access to the WiFi point. The person managing the WiFi modem/router should shut off this MAC filtering system to see if this solves the problem. It is recommended to shut off MAC filtering in general as this is now known to be an outdated and ineffective system for WiFi security. If you must use it, you can find your device's specific MAC address by going to Settings >Wireless & Networks > Wi-Fi settings > Menu > Advanced. It will look something like 00:16:dc:5e:9e:39.

5. Try temporarily shutting off the encryption system of your WiFi router/modem to see if the problem has to do with the encryption system you are using. The preferred encryption system is the WPA2.

Isn't this the same problem as this one?
http://www.fixya.com/support/t24390784-pin_no_set_in_error_tablet_now_access

The tablet has no PIN. It is the SIM card for 3G that needs a PIN to access the 3G service.
When you remove the SIM card, the tablet will work perfectly without asking a PIN.

I hope this helps.

You should be able to contact your service provider and reset your password.

You can't access your ipad, or an ebook account,can you please provide more info about this issue?!

Someone has set the BIOS password option to ON. If you don't know your BIOS password then you will have to reset the BIOS to get past this.

Connect your router to computer with ethernet cable then you can access it with following default link. http://192.168.1.1 or http://192.168.0.1 or http://192.168.15.1 or http://192.168.2.1 If you are not able to access it with above ip then check your computers ip address gateway ip is your router ip try with it. Then it ask for user name and password. Type user as "admin" and password as "admin" or "password" or blank. Then you can see configuration page of router. If you are still not able to access router with above ip then you need to RESET it for that press RESET button for 10 seconds it is in back side of router then all settings defaults..Then you can access it with above method. . Then click on wireless->wireless security->WEP security there is code password note down it or enter new password then save setting s and restart router. then you can connect wireless with new password. Let me know if you need further assistance. Thanks for using FixYa.