I just did a clean install of windows xp on my pc and now i cant get a internet connection.What to do?

Internet help?

My laptop has trouble with the internet. When I first start the computer, the internet works great. I use internet explorer. I would like to use yahoo browser but somehow, I can’t download it. I have a CD but it’s corrupted. I tried downloading it from the Yahoo Software website, but it didn’t work. Anyways, if I hibernate my computer, and I use it again, the internet explorer won’t work.
It says:
The address is not valid. For every website, it says that. This problem occurs over and over. Please help me!!!
I tried to use the Windows connection diagnostic but it says
There might be a problem with one or more network adapters on this computer.
Then there’s three options:
briefly: turn on wireless capability – I use a DSL Modem – AT&T
automatically get new IP settings for the network adapter "Local Area Connection" – tried this numerous times doesn’t work
and: a problem with your network router or broadband modem might be preventing an internet connection
Please help!!!
My computer is 3 weeks old. How do I reinstall the adapters? I don’t even know what a network adapter is. Before I used to use the battery but now I charge it whenever I use it. One more thing, recently, like this week, I’m in the middle of browsing the internet, and it tells me my internet proxy server can’t be found or something similar. I’m so confused.

Is My r4 card a fake?!?

When i bought my r4, and tried to extract 15 games from winRAR and only 3 games worked. It always says winrar diagnostic info: it is either corrupt or had an unexpected end to the archive. is this a problem with my r4, micro sd, computer, winRAR, or internet connection? (cause it is very slow) I have the newest r4 software v.1.18 or something. to pts

Is My r4 card a fake?!?

When i bought my r4, and tried to extract 15 games from winRAR and only 3 games worked. It always says winrar diagnostic info: it is either corrupt or had an unexpected end to the archive. is this a problem with my r4, micro sd, computer, winRAR, or internet connection? (cause it is very slow) I have the newest r4 software v.1.18 or something. to pts

I have an older model Apple iMac that I am trying to run some software updates on. I am connected to the internet (I am posting this from the computer I am asking about), however when I try to run the updates it tells me there was an error because there is no internet connection. I try to run a network Diagnostic on what the problem could be and it freezes and never goes through. Does anyone know why this could be happening and what I need to do to fix it?