my dell inspiron 1440 is running windows vista. a while back, i accidentially installed an additional operating system on the laptop (not factory CD), which i don't use.
i don't know how to delete it and the main operating system i usually use, gets stuck on the welcome screen, i've contacted dell, they made me run a series of test, it is not hardware related, st least that's what the diagnostics said.
i've ordered a new operating cd from dell, not sure what i should do. please help, thank you.