When I installed Microsoft Small Business Server 2008, it automatically installed DNS and DHCP.
However we simply do not need a DNS server on our server box (we really only use it for file storage and Active Directory).
How do I go about uninstalling DNS, and just directing the server to use the ISP's DNS servers, instead of the server currently handling the DNS.
I also would like to do this remotely, so a connection will need to be maintained remotely with the server.
You do need a DNS server on your server box. Active Directory depends on and requires a DNS server that supports SRV resource records. The DNS server installed with SBS is configured to host the AD DNS zone and the SRV records that AD requires. Without the DNS server component, AD would not be possible. Without getting into the niity gritty details of the intergration and interaction between AD and DNS and the various ways to implement such, just suffice it to say that SBS installs the DNS server role by default and configures it appropriately and accordingly to support the Active Directory domain that is created during the SBS install and you shouldn't try to muck with it.
My advice to you is to leave things on the server as they are.