That's what CSS is for: positioning, sizing, and styling HTML elements. It sounds like you're either not sizing your table elements, or if you are, you're using percentages.

Instead, you should provide CSS rules for the table, tr, and td elements, using absolute pixel measurements.

For example:

Place that in the head of your document, and any table will be 500 pixels wide, no matter the browser window size or screen resolution.

What would you suggest the most common width size for a table with least comflicts with computer resolutions. as my screen resolution is 1280 x 1024 px so i see almost every website fine but that is not with everyone and i am trying to figure what size should my table should be so there are less chances of scroll bars popping up.

I suggest 1024x768 for most sites. I do a lot of work for government and financial institutions, which tend to lag behind the general public, so for them I try to work with 800x600.