I have this bugging error showing up when I try installing new legitimate software (e.g. Nero 6 or Opera Browser) as well as when I try starting already installed programs (e.g. Dreamweaver MX for one). Most programs will start. I tried re-installing Dreamweaver from the original CD - it won't, the system would give the same error that the installation file is not executable. Such a BS!
I'd really appreciate an experienced advice here.