Just an update fellas. Finally got all working ok on Vista. Yep admin and untick the files and folders as read only.

SO, after working away quite nicely for a time.... and after adding extra code for ADC, etc. this compilation/assembly error raises it ugly head........

Error[113] f:\!_Woods\plc_pbp245\pbppic18.lib 1165 : Symbol not previously defined (ROLLOVER)

Using.....

Microcode Studio Plus v2.3.0.0
MPASM v03.90
PicBasic Pro 2.45
PIC18F452

Any tips, hints, etc would be muchly appreciated.
If you need more info, please ask.

regards
Shaun Woods