cant receive updated webpage since legal XP installed

Hi, I am a newbie website builder using Macromedia suite.
I have updated a couple of sites adding buttons and affiliation banners.
I can see all the new information in dreamweaver, and proceed to upload to the site using smartFTP.
When I view the site, whether using Internet Explorer or Firefox, I cant see the new additions, but everybody else I ask to have a look can see them.
I have add/remove program the dreamweaver and re-installed 4 times. I have reloaded Windows XP twice, which was a recent update (from a copied program).
I have called Orange who is my ISP and they say it cant be them.
I have deleted cookies and files a dozen times.
I have just upgraded from IE6 to IE7 - no difference.
I have checked with my ISP (Orange) and they can view the updates as well.
I have run out of ideas......Is it possible that some cashe memory has become blocked or something? ? ? ......Help ! ! ! Please....................................

Oh, I had an illegal copy of XP which was upgraded to a legal version a day before - is it possible that this might have caused this? ? Can I delete Windows and load an older version without losing all my files? ? ? If so can you tell me how? ?

Thank you

as to your last request, it is indeed possible to do that. If you move your files that you wish to keep to a folder in the root of your hard drive, then reinstall windows WITHOUT formatting it (leave the current filesystem intact- is what the windows installer says) then after you get back on windows those folders will still be there, and you will have a fresh new windows installation.

Thanx for your reply - I'll try that.
The Wern