Perhaps you want to install a version of the PSDK that will work with VS6, the last version of the PSDK to work with VS6 was the following version:
Microsoft Platform SDK, February 2003 Edition The only way you can get this SDK is by ordering it (for about $10 -- you only pay shipping costs) from... http://www.qmedia.ca/launch/psdk.htm
Perhaps you have a version of the PSDK February 2003 or older and are having issues uninstalling, and of course don't have the media any more. You can follow these steps to rid your system of this old SDK.
You will need to do the following, to clean up the PSDK totally:
Remove Microsoft sdk reg entry (only if this is the only sdk installed):HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MicrosoftSDK
Remove shortcuts from start menu: C:\Documents and Settings\All Users\Start Menu\Programs\Microsoft Platform SDK Feb 2003
RemoveProgram Files\Microsoft SDK folder This is the painful part: Find all .msi that are releated to the February 2003 release in %windir%\installer from the cmd line you can run msiexec.exe -x nameofmsi.msi
You should also...Unregister and then remove from %windir% these controls Sdkinst.dll Appversions.dll Sdkhelpmsi.dll