Windows 7: How do I lock desktop icons in taskbar?

I have many shortcuts on my desktop, which are successfully locked in position (They don't auto-arrange.), and I have the desktop showing as a tooolbar on my taskbar. The desktop icons showing in my taskbar stayed in place as arranged until last week.

(Our IT guy cleaned my computer after a Trojan alert, and he says he only added a single icon to always show on the taskbar, but made no other changes.) Now the desktop icons in the taskbar autoarrange everytime windows explorer is turned off (or here lately, stops working for a moment).

After manually arranging these desktop icons in the taskbar, how can I once again lock them in place so they won't auto-arrange?

Welcome aboard, samkia

This thing might help you, have a look : 7 Taskbar Tweaker - RaMMicHaeL's home page