control Panel, Windows Explorer, Search…Locked

I have XP Pro SP2.
I had adware and other problems and have run norton and sysbot MS Spyware and cleaned my
system but I can not access Control Panel; Windows Explorer; Search; Recycle Bin; My Computer; My Network; My Music. I can browse fron RUN on Start. The eror says 0x10040065 referenced memory at 0x00000000 the memory could not be written.

Everything else appears to be working.

I have tried sfc /scannow and that went OK but no results.
THanks
John