Whenever I start my computer there are listed two OS for me to choose. Both are Microsoft Windows Vista. One of them came with the laptop, the other I installed via the install CD due to some problems I was having with the first one. With the new installation there were a lot of programs I could not access, such as Word, etc, as well as Windows Movie Maker and any others dealing with graphic memory, which was obviously affected by the installation of the new OS.
Anyway, I have two hard disks: Data(C:) and System(D:). I have no idea what kind of files they have, but I do know that, for some reason, my Data(C:) hard disk gets full very easily. Namely, right now, it has only 3.38 GB free out of 42.9 GB. I have to be constantly deleting pictures, videos, and such to free up more space whenever it gets the "red bar" instead of the "blue bar" (when it has less than 4 GB or so of free space). My System(D:) folder is rarely if ever affected by this, and is currently 14.5 GB free out of 29.5 GB.
I was hoping that, by deleting the old OS, I could get this space problem solved. Am I right on this? When I say "delete" I mean erase completely from my laptop, and not leave any unwanted or useless files behind and that occupy the space needed to run some programs. How exactly can I manage this? I want to leave my new OS intact, and not lose any data from it. Is this possible? Or do I have to backup all the files?
I read somewhere I could format one of these hard disks. My question is: which of them contains my old OS? And: is there a better and safer way to do it?
Thank you for your time and help,