I'll write this as if you dont have anything installed.
Download the seti CLI version from
here. Go to My Computer and click on C:/, right click and create a new folder named S@H (or whatever you want). put the file you downloaded into that folder. Next download SetiDriver from
here. Unzip the file with Winzip into the C:/S@H directory. Now go to the S@H folder and (for ease of use) right click on SETI Driver.exe and select send to and from the menu that comes out from it select desktop (create shortcut). This will put a short cut to seti on your desktop. Close out of (or minimize) all folders and windows and make sure you are on the internet. On your desktop click on SETI Driver and at first you should see a red upside down dish in your system tray. Set the desired cache size to 1 at first and click transmit. You will then see a command line window. It may ask you to either create a new account or to log into an existing account. Once you have done that it will download 1 WU and start processing it. If all went well you can increase the cache so that incase the seti data server is out you can still process WUs. Now right click on any Seti Driver Icon and select send to desktop. Take this new short cut and click and drag it to the start button, the start menu will come up. Now continue dragging it until you find the startup folder and put the shortcut in there. Now seti will start up when ever you start your computer. When you get a WU done the Seti Driver icon in the system tray will turn yellow, you must then open it and click on transmit, this will upload the result and download a new WU.
I hope that helps.