Windows 7: Upgraded to Win 7 and have problems with Boot and User

I upgraded my Dell laptop to Win 7 Ultimate from Vista Ultimate. Everything just about worked but I discovered a couple of serious issues that I need help from members of this forum.

1. I started getting warnings about my HD running out of space. I thought it was weird since I have over 60GB of space, until I noticed that my user was defined in Drive D and NOT C. Drive D is the recovery drive and C is the OS drive. I can't seem to define users in Drive C.

2. Also, I noticed that Drive D is the boot drive while Drive C is the system drive. Shouldn't Drive C be the boot drive?

Also of note, when the computer boots up, it goes into the Dual-boot mode for Windows 7 and Vista. Not sure how I got there but it was never intended; I just want Win 7.

I have attached the Disk Management image for reference. Please help: I just want to boot from Drive C and have user be on Drive C as well. What do I need to do? If necessary, I am fine with reformatting the whole drive if need be.

Thanks in advance for your help.

Here is the thing, if you really "Upgraded" that is the problem. You have to do it over, this way:
Clean Install with a Upgrade Windows 7 Version[2]=General Tips

Did you make the Vista Recovery Disks off of the Recovery partition before installing Windows 7? It is likely too late to make them now, although Recovery partition may still run from boot should you need to restore to Factory condition.

I agree with Rich and would wipe the HD first before installing to get rid of any other interference with Windows 7, achieving the cleanest possible install.

SSD / HDD : Optimize for Windows Reinstallation

Ask back if you have any questions.