Screen tearing issue

Hey brothers. For quite a time now i'm experiencing horrible screen tearing and got no idea what can i do about it. Basically the screen got problem everywhere, when i'm at windows and scroll there are those strips, like refreshing is too slow... In games i get decent fps 40-60 in full hd with high/very high settings but even with stable 60fps the tearing exist. Another symptom is kinda of a blurry textures, or edges, or whatever... It's like... Graphics are generally very fine but something makes textures distorted, it's not noticeable from far away, but when you are a gamer you definietely notice that kind of a thing.

My pc spec:

C2D E8600 3.2
GTX 260 ZOTAC
2gb ram
Win xp
old ass mobo
old ass psu

First i thought it's LCD's fault, but i bought new one and nothing changed. Obviously i've tried turning v-sync on, forcing it thru nvidia panel, setting AA max, trying with other options but neither had any impact on the tearing and distorted textures. And as i said, it's also always there while im at windows.

Tried older and newest drivers.

Any ideas? I can provide later on gameplay with those effects shown.