Disk Utility wont allow me to check off "Master Boot Record"

Today I purchased a new Toshiba 3tb external harddrive, I am setting it up for use with both mac and windows however when i plugged it into my macbook (OsX 10.8) it came up as "Read-Only" So when attempting to format it in DU I continuously got an error saying "Invalid Request" I read around online and found an article which I thought was going to help me, which it partially did. I went into the partition tab options and changed it from MBR to GUID but now it doesn't show up properly in Windows without formatting it and when I try that it just goes right back to being Read Only for mac, is there any way to set it back to MBR or a go around to allow me to read and write on both systems?

The drive is setup as NTFS which is read-only to OS X. Do this:
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to MBR then click on the OK button. Set the format type to MSDOS (FAT32.) Click on the Partition button and wait until the process has completed.
Alternatively, you can purchase third-party software that enables OS X to both read and write to an NTFS formatted drive:
NTFS for Mac 10.0.2
Tuxera NTFS 2012.3.6

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