I encounter an strange problem in my M.T.

I renew mw windows (xp) and then downloaded the new MT. from metaquotes and instead of 3.8 mb it shows 5.08 mb , by the way i downloaded it and after putting my custom indicator in it , some of them don't work . i mean after dragging them on the chart from navigator window nothing happened .

some of them is worthy to me.

thank you