Internet and Network fail

My PC will not connect to the Network router and therefor Internet on average every 2 - 3 times I switch on!
Usually the only way to get it to work is to re-boot - sometimes more than once.
I often go through the trouble shooter - sometimes it works, sometimes it doesn't
It seems pretty random.
Usually it doesn't find the cause and the re-boot is the answer.
(It did find that the LAN IP address was missing/wrong once)
Is there a setting or a box that needs ticking, somewhere in the maze that is the PC settup, that anyone knows of.??
Often it will be fine all day - then after turning off - next time it's up the creek again!!
So frustrating - especially when I turn on quickly to look something up - usually in a hurry.

I might have - can't remember - I did on the previous PC -
would this make a difference??
I will check when I get home.

? Is bonjour part of iTunes??
I don't use iTunes - but the kids do sometimes
but I still don't know If I even have it on this PC
If I have- maybe it's best I remove it then>>>???

Ok
I can't see iTunes on there - but searched the program files and found
Bonjour
What is it??Is it part of W7>?
Do I need it for anything - if not I will certainly remove it
cheers

Thanks - I will do - got to wait until I have more than 5 mins though as,
in my experience, these things usually throw up a problem as well.
I am working over the weekend and busy in the evenings!

I notice it does carry a warning however:
Warning: iTunes and some other programs need Bonjour to function. In which case do not remove!
(BTW I also have revo uninstaller which might also be able to remove it)

I am quietly hopefull anyway and will let you know as soon as I have done it
thanks

Geoff

PS - do you think this might affect Adobe Photoshop CS3??
I use that a lot