To make you're system more secure/compatible with software it's most of the times best to update to the latest version.
So if possible you should check if you can make Snow Leopard 10.6.1 work on you're system.
Or at least try to update to 10.5.8 which is the latest Leopard update.
I see from youre system specs that you're using voodoo's 9.5.0 kernel?
You should try to update the kernel to for example qoopz 9.8.0 or Andy's kernel.

Qoopz kernel can be downloaded here: http://www.mediafire.com/?mtdmi2jlgtk
Andy's kernel can be downloaded here: http://rapidshare.com/files/28472897...U-980-V1.7.zip

Also you should probably update to Chameleon 2 RC3, you can find a download link in this post here:
http://www.infinitemac.com/f36/chame...ard-and-t3972/

Could you maybe list you're current kext's that you use?

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Mac Inspiron 531 » 10.6.8 • 10.8.0 Legacy Kernel • AMD Athlon 64 X2 5000+ (2.60GHz)
Dell M2N61-AX/nForce 430/MCP61 • 4GB Dual Channel DDR2 667MHz
ALC888 • nVidia GeForce 8600 GT 256 MB
2 x WDC WD5000AAKS 500 GB SATA HDD