Do you have a large drive that is partitioned into several smaller drives? If so, you can shrink one of the other partitions (providing it has free space) and enlarge the C: drive.
If your C: drive is one partition and it's full then you need to buy a larger drive then clone your existing drive to the new, larger drive.
Do you have a large drive that is partitioned into several smaller drives? If so, you can shrink one of the other partitions (providing it has free space) and enlarge the C: drive.
If your C: drive is one partition and it's full then you need to buy a larger drive then clone your existing drive to the new, larger drive.
I am thinking you were right the first time, the drive is likely 1 big partition. Of course it is possible that the screenshot will show otherwise..Since you're running Win 7, you should be able to follow the info on the link that mrjack posted above.
If you can't then we need more info. Goto Start->Control Panel->System and Security->Administrative Tools->Computer Management. Or you can open a command prompt and enter "compmgmt.msc" (no quotes). Once there, click on Storage the double-click on Disk Management. Take a snapshot of that screen and post it here and we will be able to help you better.