Safest choice is Disk Management. You should be able to use it if you are a User Administrator. You can shrink one partition and then expand another, but only to the right.
For the exceptions we have found
free Partition Wizard CD works best for resizing partitions in Windows 7, and have used it here for over 100 dual boot extractions.
If you will post back a screenshot of your full Disk Management map, using the snipping tool in Start Menu and attaching file using paper clip in reply box, then we can advise you better. Tell us exactly what you would like to do, and we'll give you the steps.
Resizing operations can fail so you'll need to back up your files and create a Windows 7 backup image stored externally so you can start over if necessary.