Edit boot information, e.g. make MS Windows as the default choice:
/boot/grub/menu.lst
default n (n equals to the count of "title" minus 1)
Let Linux not check the Windows FAT disks when boot:
/etc/fstab
change the last figure to 0
Change the sourses list:
/etc/apt/sources.list
Before using http proxy in xterm (Terminal):
export http_proxy=http://Username:Pass...@Proxy.Server:Port