Hi. My first problem is i format my entire disk but something is not right.i install lilo each time in MBR was working fine i was installed even dualboot with windows 7.But now i cant even see lilo just boot failed.I use fdisk to format my disk.So my question is how can i format everything and install slackware 14.0? My second question is how can i fix lilo?

Did you install windows before installing slackware?
I had a similar issue with lilo complaining about not knowing the video driver (not sure why it throws that), and refusing to install. I temporarily found a fix, using grub2 like you. I ende dup using boot-recovery-disk to install grub2.

I noticed that windows 7 uses a different partition table, and lilo throws errors about it. Assuming grub2 knows how to deal with it, is why it can be installed.

I ended up wiping the disk, installing slackware first (using the classic partition table: msdos), then installing windows 7 on a seperate partition afterwards.

It may not be a solution for you though, as it involves completely wiping the partition table...

If you use periods and upper case letters to mark the end of one sentence and the beginning of another, people would be inclined to read your post. I stopped reading about halfway through, because piecing the sentences, and the problem/question together, was to laborious.

First of all thanks for reply.i am completely format my computer but some how it doesnt give me solution.My lilo was working fine then when i delete windows 7 and change the lilo.conf file i messed up. So i reformat it and lilo even not load at first it give me video error at first (in installation)then it didnt give me any just boot failed. Thanks i will change my post then.

Looks beautiful. Much easier to read.

Read this first: http://en.wikipedia.org/wiki/LILO_%28boot_loader%29

Format your Linux partition first, Install Linux, then install LILO.
You must reinstall Lilo anytime you change the partitions, or the Linux partition filesystem, the Linux binary, or any of the booted systems. You must reinstall Lilo after installing a new Linux.
When Lilo is installed it looks where to find stuff on the Linux partition. When it writes the MBR it also writes the disk addresses within the Linux partition where it finds other things, specifically files it stored in the /boot directory.
It must be able to get to the Lilo boot map file stored in the Linux filesystem.
When you wiped the disk you wiped out the Lilo boot map file.
Do not erase or move Lilo boot files in /boot on the Linux partition.
If you do then you must reinstall Lilo.

If you installed Lilo to a partition and that partition is not active (not bootable) then nothing will happen as Lilo does not get executed.

It is not as completely stand-alone as GRUB which uses more hidden disk blocks.

Some Windows disk management may try to rewrite the MBR, which will wipe out the LILO MBR.
That only messes up the Lilo MBR, which can be restored.
/sbin/lilo -M

The easiest way to fix most problems is to boot a CDROM Linux and reinstall Lilo using the /etc/lilo.conf on the Linux filesystem. This will write a new MBR, and the Lilo boot map.