Try this...

Shorten (Rename) your source .BAS filename by one character. PICBasic doesn't respond nicely to filenames greater than 8 characters (DOS legacy maximum length).

Alternatively then try this...

1. Open a DOS window

2. Log into your PBP directory...

CD C:\Program Files\Microchip\MPLAB IDE\PBP

3. Execute your compile...

PBPW -p16F84A Acetach2 -v

Please note that I have SHORTENED your filename by ONE character (rename your source .BAS file to Acetach2.bas). Also note you don't need to include the .EXE and .BAS in your command line.