How to remove windows xp off boot sequence thing?

The best way is to put Ubuntu on the C drive and use F for data.
You would need to shrink the existing windows partition and put Ubuntu in the space you made.
Then you choose Ubuntu or Windows at boot. I barely ever use Windows at all.
A few things to remember when replacing windows -- get rid of any rotten wood while you're at it... don't forget your insulation/caulk, and be sure to install them square, plumb, and level, hehe.
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speed optimizwtion not required for vista. sometimes antivirus update, windows update eat up your internet speed. disable those and try. search for any spyware which share the bandwidth. use firewall software while going online.Digital Camera Resource, digital Photography Review.
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If you've successfully remodeled a bathroom, you shouldn't have any trouble with windows.
There are two approaches to replacing windows -- make the window fit the opening, or make the opening fit the window. This is an important distinction when dealing with non-standard size window openings. I'm a good woodworker, and would be quite comfortable re-working the opening to fit a standard size window - but I prefer to make the windows fit the openings, even if it means spending a bit more on the windows.