how to fix this serial number column in MS Word 2007 docx file?

I and my friends preparing a table format in MS WORD 2007 DOCX.

something happened to serial number column, it changed into like this: [click here][1]

so I tried to lessen the width of serial number column by pushing like this: [click here][2]

so numbers penetrates into column & not visible: [click here][3]

Finally i want my want my table look like this:[enter image description here][4]

1- i.stack.imgur(.)com/KW5Gd.jpg

2 - i.stack.imgur(.)com/WbiEV.jpg

3 - i.stack.imgur(.)com/f42wZ.jpg

4 - i.stack.imgur(.)com/UyBm0.jpg