Screen Shot - can anyone tell me why my mac is doing this ?

This is a screen shot of how my mac is when it restarts. Can anyone tell me why this is ? Thanks.

Unbelievable....after uploading the screen shot from my Thinkpad running Linux it looks perfect, however this is NOT what I am seeing on my mac. Any advice ?

For starters all Application folders open like that and after a short pause the information regarding folder size etc. displays. If this is not happening, first up try running Repair Permissions from Disk Utility. If no joy, boot from the Tiger install DVD and run Repair Disk from there.

If the disk reports okay and still the problem, maybe time for an archive and install of the OS.