Try to play Halo-Unload Debugger

[gmcfan]

Every time I try to play Halo on my computer I get an Unload Debugger message. I've already looked for things like antivirus programs and firewalls and stuff, and I can't find what this thing is talking about. Any help?

[Carbon Dudeoxide]

We need more information, Please look here.

[gmcfan]

Windows XP SP2
Crucial PC5400 DDR2  677MHz 4 GB RAM
2.6 GHz AMD Athlon 64 X2 Dual Core 5000+ Black Edition
Asus M2N-MX SE Plus Mobo

[Carbon Dudeoxide]

Going to need more info than that. (software wise)

What Halo game is this?

What is the exact error message?

[gmcfan]

It's the first Halo.

When I try to start it, a box pops up that says "A debugger has been detected" "Unload the debugger and try again"

[Carbon Dudeoxide]

Have a look here:
http://support.microsoft.com/kb/812759#appliesto

[gmcfan]

Tried all five methods, still get the same message. Also don't have an audigy sound card anyway, using the onboard audio chipset.

[Carbon Dudeoxide]

Hmmm....Strange.....

You're not using a dev trainer or cheats or anything, are you? (I have read online that this may be the case).

Also, do you have any debugging or error-checking tools?

Also, when did it start?

[Carbon Dudeoxide]

Also, according to Google, try reinstalling your Video Card Drivers.

What video card do you have?

[gmcfan]

ATI Radeon X1550 PCIE HIS 512MB DDR2

[Carbon Dudeoxide]

Ahah!

This refers to the ATI Graphics Card:
http://gbxforums.gearboxsoftware.com/showthread.php?p=1284041

[gmcfan]

Cool!

Where is the best place to go to find an older driver for my card?

[Carbon Dudeoxide]

You should be able to roll back the driver in Device Manager.

[gmcfan]

I just installed this thing on a fresh install of windows XP, it's a brand new card out of the box too.

[Carbon Dudeoxide]

Can you try rolling back the driver though?