Windows Vista Home Premium takeing long to install

Hi,

I am trying to install Vista on my home PC configuration as follows ...

Sapphire Crossfire MB
1x200GB Sata
2x250Gb SATA 2 (Raid 0)
2x250GB IDE
X1900 Sapphire PCIE Graphics Card
2GB RAM

I have disabled all drived except the IDE's, installation is taking more
than 6 Hours now. 58% expanding files.

Any Ideas as to why it could be taking so long?

Steven