Yes you have to re-register off that computer - I think there is a menu item at top under Help or something to email to Windy from that PC. Yes - gotta copy over the backup reg file and double click it as Gabba says... The data files and logfiles, if they are transferred over into the same folders under /wdisplay should be picked up and no loss. At rugby in Cambridge tomorrow morning, back by about 3pm. I'll give you a call then to see how you are... Off out to Cossie Club for dinner now...