I think a msconfig should solve the problem.
This normally happens if there are any services like backup exec, or compaq
is trying to use odbc/mdac components.
do, start > run > msconfig
On the services tab, click the checkbox "hide microsoft services".
Then, disable all the services.
On the startup tab, select disable all.
Restart the computer and install.
It should install fine.
If there are any issues, send me the install log.
It should be typically in temp diretory. start > run >%temp%
Find the one which is for this installation and post it here.
Regards,
Ajith