Reformat all Partitions into 1

I currently have like 4 partitions.

I need a way to reformat all of them and reset them so all I have is just my hard drive.

One of my partitions for some reason it wont let me format because its protected or some shit..

Does anyone have an easy method to do this?

Im going to reformat my whole system and start from scratch.

I have a 250GB HD and ive had to live with 100GB because my other partitions are fucked.

 

What filesystems do they have?

 

Make a DOS disk, and use the format command. The rest is pretty self explanitory.

 

Is your file system ntfs, fat series or something different?

Google EASEUS Partition Manager, it may help some.