Whacky problem. Please help!

[JKF]

This morning my computer wouldn't start because of a "STOP:
C0000221 (BAD IMAGE CHECKSUM). The header checksum does
not match the computed checksum. The image crypt32.dll is
possibly corrupt." I managed to extract a new crypt32.dll
file from the windows xp intall disk, which allowed me to
get into windows again. But now, my taskbar fails to work
at all, some desktop icons don't work (mostly windows based
operations like Internet Explorer, My Computer, Windows
Explorer). Also, I cannot shut down via the taskbar;
instead, I have to go to task manager and shut down from
there. (When I try to shut down, I think it notes that
explorer.exe is still running). What can I do? Please help.

 

[a]

-----Original Message-----
This morning my computer wouldn't start because of a "STOP:
C0000221 (BAD IMAGE CHECKSUM). The header checksum does
not match the computed checksum. The image crypt32.dll is
possibly corrupt." I managed to extract a new crypt32.dll
file from the windows xp intall disk, which allowed me to
get into windows again. But now, my taskbar fails to work
at all, some desktop icons don't work (mostly windows based
operations like Internet Explorer, My Computer, Windows
Explorer). Also, I cannot shut down via the taskbar;
instead, I have to go to task manager and shut down from
there. (When I try to shut down, I think it notes that
explorer.exe is still running). What can I do? Please help.
.
run a full virus scan with latest virus definitions