Have a dual-boot PC with Vista 64bit and XP Pro 32 bit.  

I have enabled the memory remap in the BIOS so I now can see the 4GB (just
added another 2 GB on PC with already 2GB).  In XP I only see 2GB (instead of
2.93GB when Memory remap was *disabled* - then Vista was just showing 2.93
GB...)

My understanding is that I should add the /3GB switch in the Boot.ini file
of XP, but I am unsure on how to do since I do not get the same look and
content : Microsoft suggest that the Boot.ini file should look like this then
add the /3GB at the end:

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(2)\WINNT
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINNT="????" /3GB

But my Boot.ini file looks like this (pls note the *FASTDETECT
/NOEXECUTE=OPTIN* at the end :

;
;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=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP
Professional" /FASTDETECT /NOEXECUTE=OPTIN

Do I simply add another space at the end and type ''/3GB'' (without the
quotes) ? Or shoud I remove anything before ?

Please remember that this is a dual-boot machine - I do not wish to screw
anything (as I am not expert enough to feel at ease to recover from such a
mistake...)

Thanks,
Rob