problem with grub loader and screen resolution in gnome
during  debian installation from a new r4 cd that i downloaded from debian.org, i got the following error 
grub fatal error
during installation and then i installed the lilo loader instead of debian.
now i can access debian though i still dont know how to configure lilo to access windows. this is the first time i got grub fatal error during debian installation....
A. How do i revert back to grub loader??
B. Or how can i configure lilo to get access to my Windows??
Another problem i'm having is that i'm not being able to change the screen resolution.. all icons appear very large in size...  I tried changing the resolution but i found only one resolution is supported 640*480.. 
C. how do i make my display normal??
 
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