Unable to connect to internet

This is a pretty broad question with not enough details.

Are other computers on this wireless connection able to reach the internet?
Are you able to reach the internet via a wired connection to the same router?

Too many questions, not enough info, please provide more details.

Other computers are able to connect to the wireless router and connect to the internet.
I am to connect to another wireless network, but not the Linksys one.

This comment:

I am to connect to another wireless network, but not the Linksys one.

Does not play well with your original comment:

I am using Linksys E1550 and a Win XP PC. Though, I am able to connect to the wireless network,

Are you able to connect to your new Linksys via wireless or not?

Need clear details.

Sorry - I meant I am able to connect to the newtwork, but not to the internet.
But, I am able to connect to another router and internet, through it.

Is there any other computer that can access the internet via wireless through the new Linksys?

Yes, 2 of my friends are able to access internet via the new Linksys.

Is there a mac filter or mac address list that only allows your laptop to work only when on that list.

You have to login and verify that your router doesn't have this enabled.

I don't think that is the case because two of my friends are able to connect to the internet through the router.

Have you tried rebooting everything including the router and your system?

I did!

I am wondering it is a problem with encryption. Because my computer is able to connect to internet through a router that does not need a password.

I already tried factory reset. Can you tell me where I can downloads wireless network drivers for Windows XP?
Thanks!

Have you tried turning off firewall and antivirus on your PC?

Also, try to ping google.com as well as an IP directly (i.e. "ping 74.125.224.49"). Next try a browser (which are you using?) and going directly to 74.125.224.49 versus google.com.

the drivers should be on the disks that come with your laptop. Or they will be on a hidden partition on your laptop.

have you tried turning off the password on the router and trying to connect to the internet?

have you tried connecting to the router using a wired connection?

Yes, it is working through a wired connection.

Have you tried disabling the router password and connecting to it?