Unable To Install Spyware Blaster

I have reinstalled XP on my computer .When I try to run Spywareblaster I get the following message "The program has been damaged possibly by a bad sector of the hard driveor a Virus please reinstall " I have tried Everything I can think of .Checked The Hard drive with a Samsung Diagnostic Program Used Microsoft`s Checkdisc Program .Thoughly checked for Virusi with my installed AVG program and several online scanners . Everything seems to be OK .but Spywareblaster just will not install .I turn everything else off .will not even work in safe mode .
Is there a known answer to this problem please ?

cheers Fatherflap