Here is a easy way to take the clockworkmod file and burn it to you SD card. I have provided the program needed to do it.
Warning and disclaimer! If you mess up with SD card numbers, you can overwrite some important files (like, for example a hard drive). Also, I take no responsibility for any damage these instructions may cause. Remember, read everything that appears on screen, and read it twice. These instructions worked for me, but the may not work for you.
1. Prepare your SD Card
A bit of warning - these instructions will delete first partition of your SD card, but prevent "Access denied" errors.
Run cmd as Administrator
Start "diskpart"
Write "list disk", and make note of your SD Card disk number
Write "select disk [your SD card number]"
Write "select partition 1"
Write "delete partition"
Write "exit"
2. Flash clockworkmod image
Command line way
First, Unpack flashnul somewhere, and copy downloaded clockworkmod image into flashnul folder. Next, open cmd as Administrator and:
Navigate into "flashnul" directory created earlier
Write "flashnul -p -k", and write down you SD card number (not drive letter)
Write "flashnul [your SD card number] -P -k -L clockwork_1gb.img"
Wait until flashing finishes
Viola!