1. Winver 2004 /19041.508
2. Curtains ver 1.01
3. Hard to say, i only use Cairo Dark and my own wallpaper.
There is no rule regarding the appearance of stripes. Now, after waking up the computer, this effect was gone. If it appears, it is rather after the system boots. The system is fresh - it is about 2 months old and there is no trash there because I take care of the system and hardware.