Vista Ultimate install query

[gopi_vbboy]

I currently have XP Sp2..Intel Petium-d-3Ghz.....I have a query regarding partion creation for dual boot XP+VIsta

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Q1)I have a 160gb SATA HDD ,With 3 partitons

C:\ -NTFS-Primary partion-Xp installed-60GB capacity
D:\ -NTFS-logical Drive-[19.6 Used data]+23GB Free space(50GB capacity)
E:\ -NTFS-logical drive-7 GB free space(50GB capacity)

I want to install Vista ultimate in D:\......My question is that
After installing Vista in Logical drive D:....Will all the PREVIOUS Data will be lost?
(I mean will it be formated n installed?)

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Also

Q2)I had some problem with Vista upgrade advisor.....it never gave report n says to uninstall it.........Actually i have 1GB Ram(128 MB Shared Video ram in it)...can i install Vista?

[New]

I think it formats full drive and gets installed.Better to make one separate partiton for vista..

[sandeepk]

Vista asks whether you want to format the destination partition while installation. But better backup the data first for safety. 1 GB RAM will be okay for normal use. If you want more performance then upgrade the RAM.