I have noticed quit a few people have been having this error. Everything seems to downlaod properly, and once the program starts my screensaver shows in the bottom left corner that you can toggle from 1=snow to 4=highclouds. But once I touch the mouse (screensaver turns off) I show the sulphur file had a unrecoverable error. I downloaded the latest drivers for my Nvidia GeForce4 Ti4200. Looking at the event viewer the sulfur program failed at 19:25:26 hours, right after download was completed.
The event viewer reported:
Faulting application sulfur_4.22_windows_intelx86.exe, version 0.0.0.0, faulting module sulfur_4.22_windows_intelx86.exe, version 0.0.0.0, fault address 0x0004af2b

Could it be something with 64bit CPU amd Mobo 64bit drivers?

I take it someone is working on this problem?

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You are 6 for 6 on errored out WUs all with the same error, might want to look here. http://boinc-doc.net/boinc-wiki/index.php?title=%2A%2A%2AUNHANDLED_EXCEPTION%2A%2A%2A%2A_Reason:_%27%28reason%29%27

Usually this is vid drivers so you may want to stop using the screen saver or any graphic at all....

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BOINC Wiki

Could it be something with 64bit CPU amd Mobo 64bit drivers?

Probably not, I and several other people I know using WinXP 64bit have not had this problem. It has to be some software or driver conflict, but other than video drivers, no one has been able to find enough commonality to pin it on anything in particular. I don\'t know if the programmers have any big ideas on this, but I fear not.