|Apparently PC Mightymax 20xx (2009, 2010, or 2011) is considered to be a nuisance program and sometimes Spyware but I haven't found any evidence that it causes programs to not execute.|
You probably had more than one thing that was causing your problems.
Malwarebytes found some of them.
Apparently sometimes Mightymax doesn't actually un-install.
Look in Add or Remove Programs.
Is the entry for Mightymax 2011 still listed, or is it gone ?
If it's still listed it may NOT have actually been un-installed.
"Downloaded kellys-korner-xp.... and downloaded the exe,fix reg but it doesn't seem to run or do anything."
You have to MERGE the file into the Registry.
Download the WinXP EXE Fix.reg file here:
Choose Save, not Run.
Note where you downloaded the file to.
Go to where the WinXP_EXE_Fix.reg file is.
(Note that it may be intially listed LAST in a folder.)
RIGHT click on the WinXP_EXE_Fix.reg file, select MERGE
Restart your computer.
You should then be able to run programs that are *.exe files
Malwarebytes makes log files of what it did when you allow it to remove anything it finds.
Start up the Malwarebytes program and look in the log files for mentions of anything it could not remove.