i can't install premiere cs4 on mac mini. the setup.exe is in virtual pc format as a default. what do i need to change this format or start installing?
Other than getting a PC, I don't know.
If the Mac-mini meets the system requirements for CS4, I would not think that you'd need anything to do with "Virtual PC," as CS4 is ported for either the Mac, or for the PC. No need to run it in Bootcamp, or similar. This has been since CS3.
Are you installing from the DVD, or from a download? If it's from the download, is it the "trial" version? If so, there should be both a Mac and a PC version on the Adobe Web site. I'd get the Mac version, in your case. Do look closely at the system requirements though. I know zero about Mac-minis.