1. install TuneUp Utilities, apply the bootscreen and restart
2. go to System32 and copy TUKernel.exe somewhere else (ie. to Desktop)
3. now you can uninstall TuneUp Utilities (do this before you continue and don't forget to restart)
4. copy your saved TUKernel.exe back to System32 (you can also rename it but it has to be ANSI max. 8+3 name)
5. open boot.ini in notepad, copy the line with your default boot entry to a new line (to have backup), add /kernel=TUKernel.exe (or if you renamed it /kernel=new_name.exe) on end of the first enry (bee very careful when editing boot.ini, if you screw up your windows wont boot) and set some minimal timeout so you can switch back to the default kernel if anything goes wrong
example of modified boot.ini:
CODE
[boot loader]
timeout=3
default=multi(0)disk(0)rdisk(0)partition(1)\WINXP
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINXP="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /Kernel=TUKernel.exe
multi(0)disk(0)rdisk(0)partition(1)\WINXP="Microsoft Windows XP Professional (original kernel)" /noexecute=optin /fastdetect