Vista having trouble connected to Internet

> Hi all,
> I have a compaq laptop with Windows Vista Basic pre-
> installed. It has a built in network card. I have ADSL modem which I
> have connected to my laptop via USB. The following problem occrus
> regardless if I connect via USB or via NIC port.
> On my DSL modem DHCP is on, however windows vista was never able to
> acquire an IP address from DHCP. When I change it to static ip
> (192.168.1.6) and then manually enter the dafault gateway
> (192.168.1.1, which is my DSL modem) and then I enter the DNS
> addresses of my ISP, then it works.
>
> However the problem is that evertime i logg off/on or shut down the
> laptop, I have to repeat this step again. First I make it obtain an
> IP
> address automatically from DHCP(Which doesnt work) then I manually
> re-
> enter the above info. After re-entering the address manually it
> works.
> But as I stated before, I have to repeat this step everytime I logg
> off/on or restart. In addition to this, if I leave the laptop for
> like
> 20 minutes, then most of the time I have to repeat the above
> procedure
> again.
> In my Local Area connectin properties, I have the following items
> CHECKED:
> 1. Client for MS Networks
> 2. QoS packet Scheduler
> 3. File & Printer Sharing
> 4. Internet Protocol Version 4(TCP/IPv4)
>
>
> The following items are UNCHECKED:
> 1. Internet Protocol Version 6(TCP/IPv6)
> 2. Link Layer Topology discovery Mapper I/O Driver.
> 3. Link Layer Topology Discovery Responder
> Please be advised, at one time I had all the above checked, still I
> encountered the same problem.
>
>
> Additionally, my "Network Discovery", "File Sharing", "Public folder
> Sharing", Printer Sharing and Media Shraring - all are OFF. Only
> PASSWROD PROTECTED SHARING is ON.
>
>
> Can anyone pleaes help me with this, its kind of frustrating to add
> the settings manually every hour.
>
>
> Thanks in advance.
>