I bought a new Vista programme in English and loaded it on my computer. Unfortunately I loaded it on my D drive, realised what I had done and loaded it on my C drive. How can I delete it from my D drive?

for me to help you will have to be more specific, however i will try,
if you installed/loaded vista opertating system on drive d then the best thing to do is to format drive d, if this is the case then confirm and i will explain in full. DO NOT ATTEMPT TO FORMAT IF YOU ARE UNSURE OF WHAT YOU ARE DOING, i can do it for you if you require.
if you installed a third party program (a program that is not part of windows)then you can simply delete the folders that are within the D drive, because you say that you have installed the program on drive c after, all the system files will be used by the drive c installation, also note that when you install a program it does not really matter which drive you install it on as all the required system files are installed on drive c, however, it is simpler to install to drive c.
like i said earlier, if this does not help then try to be a bit more specific e.g. what is the program called?

I installed a legal English vista on d by mistake and then installed it on drive c. I now have vista on my computer twice. When I boot up my computer I have vista on it twice. I was thinking of recovering back to the original settings on my computer, vista spanish, and re-installing vista english. Will this work? Many thanks for your help Wayne

Did you get this resolved Chrissie

No. It is a fully legal vista home premium. Do I reformat drive D? If so, how do I do this?

Many thanks:(

to format drive d you need to double click on "computer" thats on your desktop (if its not there, then click the start button and you should see it on the right hand side) once thats opened you should see a window that shows a list of your drives (drive c, drive d, dvd and so on) right click on drive d and a menu will appear, about half way down you will see "format", click on that and the windows format utility will come up, the first drop down tells you the size of your drive, the second is file system, this needs to be ntfs,
allocation needs to be default, label can be what ever you want to call it. uncheck quick format (no tick), make bootable dos needs to be unchecked too (no tick). click start.
WARNING! everything that is on drive d will be deleted so if there is anything on there that you want to keep, transfer it to drive c before you format.
hope this helps.