why internet connection/ISP can't display some sites,why is that? ?

[liverpoolstudio]

here's the thing: everytime i visit a site, like photobucket, or dpreview.com, the page cannot be displayed. i figured that my internet connection has something to do with it (duh.hahaha), when i opened the control panel and clicked on network connections. i right-clicked on the LAN connection icon (mine is Marvell Yukon 88E8001/8003/8010 gigabit ethernet controller), and i clicked "repair", and whoosh, i opened my browser and the said pages can be displayed again. so my question really is, HOW CAN I PERMANENTLY REPAIR IT? i know there are some tech gods out there who can help me!

[Vision]

when you repair your internet connection.. it disconnects your from the internet...
about the websites there can be few reasons :
1. problem at their site
2. problem with you isp .