Vista upgrade problem?

i enjoy a laptop acer 1673WLMi with window xp home.when i try to upgrade with vista at the ruin of installation says that folder NETFLT.SYS not installed and prompt me to repair the installation with vista dvd.But when i do this at the back nothing happen and vista cannot start.

Answer:
search thi forum
are you using Panda anti-virus?
Go to Global Acer.com or try this website eHow !
STAY AWAY FROM VISTA...that human being said... Make sure you have 1GB or more of RAM ( the more the better) and the unmistakable space on your hard drive for installation.
One sound out, I have vista perfect install on my desktop and I recieved the same error but solely when I did not enter the key, I be planning on entering after the installation which it gives you the choice... Try entering the push button and see what happens.

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