Windows 7 / Vista - Please Help!

right, so ive had this computer now for a couple of month and when i bought it it had vista home on it. so yesterday i decided to purchase windows 7 and give myself abit of life on my computer.

i put the disc it and selected the instructions i wanted it to do;
- it coped new files
- expanded windows files
- installed features
- restarted

and then when the windows screen came back up with the windows 7 completion it got just to the end and i got an error message saying windows couldn't install please restart and try a again. i pressed of it and it restarted, it when came back on the same screen and just keeps doing it! i fought awel ill just have too have vista on, i took the windows 7 disc out, turned the computer off and then turned it back on.

now every single time i turn it on evan through the disc isnt in, it trys to install it. it doesnt evan get to the log in screen where i could access everything, its just after the 'windows is loading' i have tryed loads to try and get it off, safe mode ect... and i get the same!

please could someone tell me how just to get back to vista, windows isnt made for me by the looks of things!

Nobody knows the slightest thing about what type of computer you have.

Please fill out your system specifications. We need to know what you have.

Unless you made a new partition to Dual Boot Win7 with Vista then it has overwritten Vista and you would need your Vista Recovery Disks or a Vista installation DVD to reinstall. You can try booting into the Vista Recovery partition if it's still there, but first let's try troubleshooting your Win7 install to make it work.

Please reboot with the Installation DVD and follow these steps: Clean Install Windows 7

Tell us exactly where it fails and any verbatim error message or describe what happens.