Windows 7 - dual boot problem

I was dual booting XP and 7, and after I reformatted my XP partition I no longer get to choose which os during booting. It automatically boots XP. How do get back the screen that lets me choose between XP and 7?
Thanks

You reformatted your XP partition? Did you also reinstall XP?

yes

Install EasyBCD and add the missing OS using Add/Remove tab. EasyBCD 2.0 Beta - Build 76.exe

You'll need to install Net Framework 2.0 to use EasyBCD in XP.

The other method is to boot into Windows 7 DVD repair console to run Startup Repair 3 times to recover the MBR into and restart Windows 7. Then run a Repair Install from the Windows 7 desktop to correctly reconfigure the boot as Windows 7 does when properly installed last.

I tried the EasyBCD but it couldnt find a registry.

Registry? Please explain. What registry does it need?

Did you install Net Framework 2.0 first?

Microsoft .NET Framework 2.0 is installed
When I run EasyBCD, I get an error saying

Error Opening BCD Registry
The boot configuration data store could not be opened.
TThe syst4em cannot find the file specified.
Would you like to manually load a BCD registry for EasyBCD to manage?

Go ahead and accept the files it offers since it would not ask if it doesn't need them. It is fully automated.

Here is the tutorial you should be following, Method Two Windows 7 dual boot where XP was installed last:

Dual Boot Installation with Windows 7 and XP

At the end of Method Two install, It shows screenshots of how to use EasyBCD.

Basically add the OS missing in EasyBCD listings in Add/Remove tab by name, type and drive letter. It will do the rest. You have the latest version which will automate most of the steps for you. Just accept and click thru.

I was going off of this guide
Recovering the Vista Bootloader with EasyBCD - NeoSmart Technologies Wiki
I had to go find the bcd file from my windows 7 install
I tried the first method of reinstalling bootloader but it didnt do anything.
I tried the second method of resetting the bcd storage but now I cant boot at all. I get a error

disk read error occurred
press ctrl+alt+del to restart

at this point I'm tempted to just do a complete clean install

The one thing that you didn't try is what it says in the tutorial to do, and what I suggested an hour ago:

Not reinstalling the bootloader or resetting the BCD, simply adding Windows 7 to the Boot Menu, fully automated in EasyBCD 2.0

It may be beyond Repair, but at least try the actual procedure.