don't know if this is your problem (copied from geforcefaq) but here goes
Q. Windows locks up before it finishes loading, and a thin green line may appear across the top of the screen. How can I fix it?
This may be caused by the Backup utility supplied with Windows 9x attempting to detect new tape devices on boot. You can fix it by deleting the files drvwppqt.vxd and drvwq117.vxd in the Windows\System\Iosubsys directory. If this helps, then search for the string 'TAPEDETECT' in your registry and delete any entries that exist. If you find this causes your tape drive to stop working, you'll have to reinstall Microsoft Backup. You can also simply uninstall Microsoft Backup if you don't use it.
Try updating the motherboard's BIOS. In particular on some Gigabyte boards based on the VIA KT133 chipset this may fix the problem. See the following page for more information:
http://www.giga-byte.com/faq/question/question_kt133.htm
You may find that on motherboards that are only AGP 1.0 compliant you may be able to fix this problem by putting insulating tape over the last pair of contacts on the AGP connector on the GeForce card (the contact furthest from the monitor port, on both sides). This has been tested on the Chaintech 6BTM motherboard.
Try disabling the Windows startup sound.
Make sure that VSYNC is enabled in the NVIDIA control panel.
If you have IomegaWare installed, try uninstalling it. If this fixes the problem, just use Iomega Guest.
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