Have you declared your path to MPASMWIN?

From the error message it looks like it can't find it.

I run Windows XP/Pro... and happilly execute PICBasic in a DOS Box.

When you first call up a native DOS box it dumps you into your personal Documents and Settings subdirectory... in my case it's...

H:\Documents and Settings\Melanie

Now this in reality is no good to man or beast. So I've created a batch file (called run246.bat) whose job it is to drop me into my current PBP directory (version 2.46 hence the name) and to provide the needed paths for my environment... so my batch file simply contains the lines...

cd\data-reference\pic\pbp246
path h:\data-reference\pic\pbp246;h:\Program Files\Microchip\MPASM Suite

Simple... works every time... even with Win98... all I simple have to do is Open a DOS Window, type [b]run246[\b] hit ENTER and I'm in business ready to play with whatever compiler takes my fancy.

How do I create a Batch File?

Simple too... just type EDIT when you first open your DOS box.

How do I open a DOS Box?

In Windows XP you'll find it in the Accessories sub-menu... they've called it "Command Prompt".