Have you installed gpx_patch? If you have, when GP4 crashes to desktop, an error log is produced. Copy the log and paste it here so we can read it.
gpx_patch must be set to 'verbosity high and CPU to 1. GP4.exe must be set to run in WinXP SP2 or SP3 compatibility mode, right click the exe and set the properties.
If you have not installed gpx_patch, download it from gp4db.com.
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www.mediafire.com] Some say you should click it, you know you want to.
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www.gp4central.com] <----GP4 Central