Error message after start up

I have a dell 530s running Vista, I get the following error message after start up:

C:\users\name\appdata\local\temp\ddcBUmNG.dll is not a valid win32 application.

This may have been caused because I used an adapter to connect the Hard drive to a 64-bit system, to see if drive was working, since the pc would not turn on, which turned out to was actually due to a faulty power supply.