Asus Eee PC 1005HA - 64bit or 32?

[rangor gubbins]

As the title says.
If i want to install win 7 onto my Eee PC 1005HA can i use win 7 64 bit or do i have to stick with 32?
Anyone know any disadvantages of using win7 64bit on a netbook?

 

[rangor gubbins]

cheers