Thank you very much, my network is wireless and it has only two computers and the issue only happens on this computer that has Windows 7 installed on it, my other PC has Windows XP pack 3 and it works just fine. I really appreciate your comment on this.
Oh, I forgot to mention that this PC was having too many issues with Windows 7 so we decided to do a clean and new installation and it is working better now but we are still having this issue with the Internet
Comments
One thing you didn't say is whether this is wired or wireless? If wireless, it could be a whole host of different issues.
The first thing I would do is update your network drivers. Then tell us whether this is wired or wireless.
Also: Do you have more than one computer on this router? Is the internet intermittent on all of them or just one?
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I really appreciate your comment on this.
What kind of Wi-fi card do you have and what version of Windows 7 (32bit or 64bit?)