|From within Task Manager you can do the New Task... button. Have you tried doing explorer.exe ???|
Possible you have an infected computer.
A web search for wajhcwp.dll yielded nothing.
Most Virus and Spyware scans are likely to work better in Windows Safe-Mode.
Taskbar and Icons missing:
(Original Message, and Response Number 1 looks like a fix?)
Also try this:
(That one is a special Posting someone made of how he fixed it.)
Another fix is un-quarintene explorer in Spydoctor.
This page has alot of XP fixes
Some require the download of a VBS file.
So, read at the top of that page--
"How to use a VBS file"
Go to line 195 in right column.