Helppppph with my DSL connection

Hayyyy... I havent been blooging for some time now because Im having a problem accessing my OWN site. Yup. You read right. I think there is something wrong with my PC or my connection to the internet. I cannot access many sites I frequently visit like my own Multiply site. Can anyone give me a clue on what's my problem? Do I need to reformat my PC or do I need to reconfigure my LAN/DSL settings? Any comment or suggestion will be highly appreciated. Help me! Sayang naman tong DSL ko. Hayyy I hope I resolve this shit soon or else Im gonna lose my mind. Joke lang para yun lang e. Hehehehe.