problems accessing one web site on cable ISP but not dialup

Shines the Geek Light in the Sky Hoping for Answers

I have a question for you all that I hope someone can help me with.

I have to check email and the website for where I work from home. I have a problem that I had for a couple of days 2 weeks ago, and that has again developed the last two days.

I have cable internet at home, and lately, when I try to access any of the work websites, I either get one of those pages that says there's no DNS entry or the DNS thing is down, or I get a message saying the page can't be found, or I actually get on the main page, but every link from there says can't be found.

I tried all 3 browsers (IE, Mozilla, Netscape) and all gave me the same result. I had a friend log on to the site from her house to verify it wasn't a problem on that end. So, the next thing I tried is logging onto my backup dial-up ISP, and voila, it worked.

I had the same problem today. I couldn't get into anything on the site with my cable ISP, but as soon as I logged on to dial-up, it worked. I even tried getting into email with dial-up, disconnected and then tried to click stuff in my inbox when just on cable while I had the page up. It didn't work.

As far as I can tell, I've not had this problem with any other web site.

My question for you is, do you have any clue what would cause this? Is it an ISP issue, a Windows issue, or something else weird? I'd like to get this fixed since obviously working from home is much easier and faster on broadband than dialup.

I'm using Win xp media edition. (Other specifics available as needed at the discretion of the poster.)

Any clues would be much appreciated!
Thanks!