UPX and an EXE-Protector

Hello,

If I pack a file with upx then run the file.

Bud If I protect the packed file with an exe-protector
the the file do not run.

If I use PECompact or ASPack the I use an exe-protector
the file run perfekt without problems.

Can I use upx and a exe-protector with a other command
option or do not run...

Thanks..