Windows Installer error while cleaning malware

I was going through the Read & Run Me steps given to get rid of some malware that was giving me the BSOD, the only steps I couldn’t complete were the sun java step and the last step, when I try to install the cleaners or the java update/ or remove an older java version, I get either an error message saying "windows installer failed to complete, Windows installer may not have been installed correctly, please contact support and help" or I don’t get anything and the program never installs.

Any help would be much appreciated, thanks. Also im using windows vista.

 

i've just noticed this after a program told me it couldnt run in safe mode, but it appears that my pc is starting in safe mode without me telling it, cause the toolbar where the start menu is located is white instead of blue. could this be the problem im having? if so how do i fix it? Also when i start my PC and click F8 im not given the option to enter safe mode.