My wireless network stoped working one day

Safari is Apple's browser -- not a very good one and many Mac users avoid it -- so it's hard to understand why Apple would imagine you need it installed on a PC.

If your wireless adapter has its own utilities try running those first. If no joy you might try re-running Window's network wizard which may restore TCP/IP settings and give you back your networking.

If it was me I'd uninstall iTunes and take the iPod back to the store and complain that they screwed your computer.

There are equally good MP3 players from other manufacturers which don't require any software like iTunes -- in my view an intrusive and (pretty incomprehensible) piece of Mac software that has been adapted badly to the PC.