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after changing the xp mode to standard pc (from ACPI) the Pulsar driver simply wont work. (Error code 39) I suspect it has something to do with pci slot (it's slot 1)
or pci channel (2) or IRQ #.

What should I look for in ordr to make my Pulsar Driver fit again?

Reinstal Pulsar driver.

Oh come on.

Any one serious around here?

reinstall sounds good......

Did you already find the Optimize your Win2k/XP thread?

Turn Plug and Play to NO in the BIOS, use PIC instead if APIC if you have the choice, and install XP in Standard Mode.

Install your XP driver for Pulsar, I do this by going to Control Panel, selecting "Classic View" for Control Panel, and selecting Add new Hardware, with the Pulsar PCI card already installed, and the Pulsar 3.01 CD in the drive (or, if you downloaded 3.01, have it extracted). Driver should be found and installed; you can reboot now, or you can install the V3.01 software, and reboot directly after.

Forgive me if this will be a moronic question but do you mean reinstalling Windows XP from scratch?
I switched to Standard PC through device manager so as to avoid the erasing of my start up disk...

After you've changed HAL mode, Windoze will re-detect all hardware again. If it doesn't, try to do so manually...

This is exactly what I did. It redetected all devices on the next boot which looked worrying, but after that everything worked without a hitch and is smooooooth.

So although doing everything from scratch may be recommended the "quick and easy" method here worked fine for me.

always the quick and easy way first(you can delete the device entries,redetect and then clean the registry w/ regclean and/or easycleaner) and then if the install is screwed you can format and reinstall.if the install is corrupt,how else can it reliably be fixed?facts of computer life........

<i>if the install is corrupt,how else can it reliably be fixed?</i>

From your Clean Ghost Image or System Restore Point...