Help - How do I un-install Vista RC1 & fix the boot sequence

I have a PC that has two OP system running (because I have lots
of junk), Windows XP Pro on D: Drive & Win98SE on C: Drive.
I had to load Vista RC1 on E: Drive, and it loaded OK, with some
exceptions. My network and the sound cards are not compatible
for Vista. At this point, I am not ready to replace these cards.
As I boot my PC, it gives me two choices first - boot from Vista
or boot from the other operating systems. When I select the second
choice, it takes me to the original boot sequence, where I can select
the WinXP or Win98SE. My question is -

(1) To remove the Vista RC1 from my PC, I have to
re-format the E: drive, but how do I manipulate the booting process,
so that I can return to my original boot sequences?

(2) Is there any easy way to learn to use the 'BCDEDIT.exe' to
modify Windows boot options?
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Original boot.ini file was like this :-

[boot loader]
timeout=5
default=multi(0)disk(0)rdisk(1)partition(1)\WINDOW S
[operating systems]
multi(0)disk(0)rdisk(1)partition(1)\WINDOWS="Micro soft Windows XP Professional D-Drive" /fastdetect /NoExecute=OptIn
C:\="Microsoft Windows 98 Sec. Edition C-Drive"
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After Vista loading, the boot.ini file shows :-

;
;Warning: Boot.ini is used on Windows XP and earlier operating systems.
;Warning: Use BCDEDIT.exe to modify Windows Vista boot options.
;
[boot loader]
timeout=5
default=multi(0)disk(0)rdisk(1)partition(1)\WINDOW S
[operating systems]
multi(0)disk(0)rdisk(1)partition(1)\WINDOWS="Micro soft Windows XP Professional D-Drive" /fastdetect /NoExecute=OptIn
C:\="Microsoft Windows 98 Sec. Edition C-Drive"
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