JSI Tip 8346. How do I blow away service pack and hotfix uninstall registry entries AND folders?

My systems always seem to have excess service pack and hotfix uninstall folders, and registry entries, mostly from my participation in the betas.

Prior to installing a new service pack release, I use DelHotFix.bat to delete all previous service pack and hotfix uninstall folders, and the Control Panel / Add or Remove Programs registry entries.

NOTE: I am NOT recommending that you do this, but you could run the DelHotFix.bat in display mode.

The syntax for using DelHotFix.bat is:

DelHotFix [/D]

Where /D is an optional switch that causes the folder and registry key deletion.

DelHotFix.bat contains:

@echo offsetlocal@echo DelHotFix [/D]set sw=%1set key=HKLMSOFTWAREMicrosoftWindowsCurrentVersionUninstallset blank= set fnd=findstr /L /Ifor /f "Tokens=*" %%a in ('reg query %key% ^|%fnd% /C:"UninstallKB"') do ( set UK=%%a call :parse)for /f "Tokens=*" %%a in ('reg query %key% ^|%fnd% /C:"UninstallQ0"') do ( set UK=%%a call :parse)for /f "Tokens=*" %%a in ('reg query %key% ^|%fnd% /C:"UninstallQ8"') do ( set UK=%%a call :parse)set key="HKLMSOFTWAREMicrosoftWindowsCurrentVersionUninstallWindows 2000 Service Pack"call :SPset key="HKLMSOFTWAREMicrosoftWindowsCurrentVersionUninstallWindows XP Service Pack"call :SPset key="HKLMSOFTWAREMicrosoftWindowsCurrentVersionUninstallWindows Server 2003 Service Pack"call :SPif /i "%sw%" NEQ "/D" dir /b /a /ad "%SystemRoot%$NT*"if /i "%sw%" NEQ "/D" goto finishfor /f "Tokens=*" %%d in ('dir /b /a /ad "%SystemRoot%$NT*"') do ( @echo Deleting "%SystemRoot%%%d" rd /s /q "%SystemRoot%%%d"):finishendlocalgoto :EOF:parseset UK=HKLM%UK:~18%for /f "Tokens=2*" %%b in ('reg Query "%UK%" /v DisplayName') do ( set name=%%c)if /i "%sw%" NEQ "/D" @echo %UK% %blank% %blank% %name%if /i "%sw%" NEQ "/D" goto :EOF@echo REG DELETE %UK% /FREG DELETE %UK% /F@echogoto :EOF:SPset OK=Ncall :SPX>nul 2>&1if "%OK%" EQU "N" goto :EOFif /i "%sw%" NEQ "/D" @echo %key%&goto :EOFset UK=%key%@echo REG DELETE %UK% /FREG DELETE %UK% /F@echogoto :EOF:SPXfor /f "Tokens=*" %%a in ('reg query %key%') do ( set OK=Y)