You know, when I got my PC I had 2 partitions (40&40 Gb) too. But I wanted to have a good organized my PC. So I use partition manager. At first I shrink my "C" part (to 10Gb it's enough for my OS) and create new one for apps and other programs. This software allows do it without losing any data and. Note: if you just remove some drivers and utilities, it could cause some damage, but if you remove the whole partition everything will be ok. In future you'll be able successfully install your programs on other drive (not on "C"). Just create folder for example F:\Program Files (some programs allows point the way).