I have dell inspiron, previously I installed Ubuntu 11.10 on my Windows 7 and made it dual boot.
But since I want to upgrade my Ubuntu version and change the partition spacing, I deleted 11.10 partition directly and extended my hardrive space (Windows + Ubuntu) at that moment everything was fine.
Then I prepared a 12.04 32bit USB and installed it . It was installed but isn't showing dual boot option like 11.10 and my machine directly boot into Windows 7. So instantly i again deleted my 12.04 partition .
Now I login into Windows 7 but whenever I put USB ( with 12.04 ) to boot from it, I am facing error of "no such partition grub rescue" even though I try to put lower version(11.04) it showing another error "Error: No default or UI configuration directive found boot >"
I have reinstall Windows 7 and reformat all partition, still I am facing same error :(