why do i keep getting this

[Dean]

this still deals with getting the following error each time i build. this did not start happening until yesterday.

--------------------Starting Build: '422build.bld'--------------------
Building project step 'mlsall Project'...

Process completed with exit code 128
Building project step 'Copy files to InstallShield'...



also is there a way to check if a certain exe or dll's exist if they do not then fail?