Network only works in safe mode

Hope someone can help, i am starting to pull my hair out over this!

I have 3 laptops Vista Home Premium (all wireless) and a Dell Dimension 9000
XP SP3 (wired) all on the same network. The network connects via Virgin NTL,
and uses a NTL modem and a netgear WGR614-6VGUKS wireless router.

Up until last Saturday, everything has worked perfectly, being able to
connect all the time on all machines. Then on Saturday, the lights on the
modem weren't working correctly, which was a fault with my ISP, and stopped
the laptops from connecting to the net periodically. This was re-established
about an hour later.

The on Sunday i went on the net with my PC, and was on about an hour before
things started going wrong. I was on the net along with another 2 laptops in
my home, when we all lost our connection. I switched them all off, unplugged
both the modem and the router to reset them, but couldn't get any connected
at all. I rang my ISP, Virgin NTL, and they took me through several routines
to try and reconnect to no avail, and they told me it was my firewall. I was
then on the phone for about 6 hours arguing with them, and asking how one
firewall could affect 2 wireless laptops and a wired pc.

Anyway, they tried all sorts to get me connected, until they got me to
connect direct through the modem on my pc and in safe mode with networking,
and Boom, it was connected. We then tried the same thing, but with the router
and modem connected together again in safe mode and it was connecting, but
not in normal mode. We then tried connecting each laptop wired, and they were
working fine, and also wirelessly fine. But, when i now connect my pc to the
network it will not connect, and it also stops the laptops from connecting
wirelessly, but all the laptops work if i disconnect my pc from the network.

So, the main problem now is my pc and getting it connecting again. I have
searched the web for answers, and have tried several solutions. I have tried
clearing the netbt and fixing the winsock, but nothing has worked and i am
going mad.

To summarise the problem, when i connect my pc in normal mode to the network
i can't connect to the net and it stops the laptops from connecting also.
However, if i check the properties of my local area connection it is
connected, sending but not receiving, this is also clarified by the lights on
my modem. Also, if i check my network in McAffee it says i am connected, but
i can't run any updates to it.

I am running McAffee antivirus and Spysweeper Spyware software on my pc, i
have checked all the settings on both, and all the settings on my windows
firewall and everything is all the same before the trouble started. I have
also run both a virus check and spyware check and found nothing. I have also
tried completing a restore and this doesn't work either.

Please help!!