hello i have a computer that has the regular c and d drive and a g drive was installed, i wiould like to make the g drive the main drive and the c/d there. however there is infomation already there. on both drives.

c : drive 40 gig main
g : 200 gig = Slave

You would have to reinstall your operating system to move C:

You can move the contents of D: if you wish

C: cannot be altered after the operating system has been installed.

Another possibility is cloning your old drive to the new.

Great, how to i clone the c drive to a new hard drive?

Who is the hard drive manufacturer?

You will need to open the computer to do this. Are you familiar with working inside computers?

yes some

is there a link step by step?

Who is the hard drive manufacturer?

Maxtor

Cool. Maxtor & Seagate are now one company so Seagate offers MaxBlast 5:

MaxBlast 5 | Seagate

With MaxBlast 5 you can clone your old C: / D: drive to the new 200GB. In the process you will have the option to resize or remove partitions as well.

Does your computer have a floppy drive or only a DVD/CD drive?