Navigate to your windows or winnt directory.
Make a copy of explorer.exe put it somewhere safe. make another copy name it explorer1.exe, put it in the windows directory.
Download a version of a Hex editor on a freeware site.
Open up explorer1.exe in the Hex editor .
Search for strings named Start
Heres some help with the offsets:
Windows 98
Offset: 0x00028D6E - 0x00028D76
Windows NT4
Offset: 0x00028BEE - 0x00028BF6
Windows ME
Offset: 0x00033DDE - 0x00033DE6
Windows 2000
Offset: 0x0003860E - 0x00038616
Windows XP (Enhanced Start Menu)
Offset: 0x000412B6 - 0x000412BE
Windows XP (Classic Start Menu)
Offset: 0x0004158A - 0x00041592
Windows XP SP1 (Enhanced Start Menu)
Offset: 0x0004208E - 0x00042096
Windows XP SP1 (Classic Start Menu)
Offset: 0x0004259A - 0x000425A2
start will be just before this:

There was an internal error and one of the windows you were using has been closed.".

now rename start to another five letter word of your choice like Help

save the modified explorer1.exe

open up regedit, you are looking for this key:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]

search for the value named Shell and make it equal to explorer1.exe.

restart for changes to take place.

alternatively, close all apps, fire up task manager and end the process explorer.exe, start new traske explorer1.exe and there you go.

if PC dont boot, slave off , navigate to your windows delete explorer1.exe and rename explorer.exe to explorer1.exe, plug back into your PC and there you go back to normal, i assure you it works great!