process for formatting my windows7 dell inspioron 545 desktop?

[Steven]

im trying to format my dell inspiron 545 desktop. OS is windows 7. i absolutey know nothing about a computer beside playing games and internet(shame on me). just a simple question.
HOW DO I DO IT?

i know u need discs to reinstall everything. i have 'Drviers and utilities' and drivers and documentation' disc but no windows7 disc. a lot of people say that i will need a windows7 disc cuz im wiping everything off my computer including my windows7. im just little scared to do it because i really need my computer and internet access for online school and gaming of couse lol.

ill just list my questions below.

1. do i need any other cds besides ones that i have?
2. after i format my hard drive, am i going to have a internet access right away?(i have modem connected to my desktop)

if you can tell me how to do it step by step. i will really appreciate it

reason for formatting my computer is cuz everytime i turn my computer on, it doesnt start a windows7 unless i start in a safe mode.

Thank you guys so much.