Hello oxenholme
This has always been an issue with 3 dongles unless you get it installed correctly first time. Firstly remove 3 connect and the Huawei
driver from programs and features list and re-boot.Wait until the pc has fully loaded and insert the modem.If you have autoplay enabled the install dialogue will appear follow the instructions to install, if not open by right clicking the 3 icon on the my computer page and run autoplay.
Now at the end of the installation the three dashboard will appear waiting for you to press connect. Don't, instead remove the modem wait a few seconds then insert again. The
drivers will install for a second time, wait for this to finish then click the 3 icon on the desktop to fire it up and press connect.
For some reason the first time you install, windows sees it as a CD drive, don't know why but its always been like that.
As for the update it probably best to download it direct from here and flash the update onto the modem direct -
Three - Help & Support - Mobile Broadband.
Once its set up you can set it to start on boot and minimised and it shouldn't bother you again
Danny