Thanks, but this is not the solution and doesn't make any difference. I've tested Xolox in Win 98 mode and every other mode listed (win 95, win 2000 etc) on Two different Win XP PCs with exactly the same problem regardless of which compatibility mode it is in.

1)I start Xolox
2)I press Windows Key and L to log off
3) I log back on immediately to same account without doing anything else (makes no difference if you log on to another account before logging back to original account)
4) I get this error:Version: '1.4 Beta 1 build 461'
Error message: 'HMODULE: 4194304 Unhandled exception EHandleOsError Exception message:OSError in Xotella.Timer1Timer: Prev call stack: [0040ECA2] [0040ECD0] [0043DF4A] [00421C16] [00525541] Call stack: [0050A408] [0043DF4A] [00421C16] [00525541]'

(which I have sent to XOlOX)

Any further suggestions would be gratefully recieved. Thanks.