Won't Connect to Internet After I-Tunes Download

Question

After I download I-Tunes software on to my computer the computer will not connect to the internet after it is turned back on. This problem goes away if I system restore to a date prior to loading the I-Tunes software. I have done this twice with the same result. I am running a new Dell computer with Windows Vista Home Premium. I have contacted Dell and QUEST my DSL internet provider and spend hours on the phone with them. They both agree that the problem has to do with the I-Tunes download but can not tell me anything other than that. I just bought my wife an I-Pod for her birthday and I will have to return it if I can not resolve this issue. Thanks for any help you can provide.
Ray

Answer 1

Try zapping (resetting) the PRAM: Turn the MBP off, then, when you restart, hold down the -Option-P-R keys. It will chime, then restart and chime again. Let this happen twice (2 or 3 chimes) and then release the keys.
Reset the SMC (System Management Controller)
If the computer is on, turn it off.
Disconnect the AC Adapter and remove the computer's battery.
Press and hold down the power button for 5 seconds and then release the button.
Reconnect the battery and AC Adapter.
Press the Power button to restart the computer.
For good luck, repair disk permissions:
From the Finder, click on "GO", then "Utilities" on the drop down menu. Open Disk Utility, select your Mac HD, and click on repair disk permissions.
Good luck!