Have Extra Partition On My Harddrive - Don't Know Where It Came From

for some unkown reason, I have another local disk on in my computer. Instead of my 'C' and my 'd' for recovery, I know have a 'e' local disk. It's 1 gig and about 600 mb used.There are four main folders, CLSetup, Documents and Settings, Program Files and Windows. Also a file call ntldr. In the programs folder there is common files and windows media player. in the documents and settings folder, there is defaut user, local service and networkservice. In the CLSetup folder, there is AP_Pack, inside that, 00, inside that, several files. Of course there are files in all the other folders too.