You do realize how old Halo CE is right? The Halo CE port on Pc was done only about a few years after the first games release on Xbox , meaning that it was still running on Halo 1 's engine which was designed for the intention of supporting 4:3 monitor screens . Regardless if your monitor supports 1080P or not , the game won’t recognize it as it does not support 1080P though there are ways around this . There is a way to change the quality from editing the property settings which is really easy to do, also you should try installing open sauce 4.0 , the newest halo ce or pc patch (Based on what version of halo ce you are using) . heres a link for the latest patch: Halo PC/CE 1.0.10 now available > All Topics | Forums | Bungie.net Here is a link for open sauce 4.0 : http://haloce3.com/downloads/applications/open-sauce-4-0/ here is a link for editing the property settings to support 1080P :- YouTube also if you need help with issues relating to halo ce you should really look at Halo CE Maps and Halo CE’s websites. They offer alot of help and support for the halo ce community and have been doing it for well over 7 years. 
Hope dis helped!!!
Is this supposed to be informative towards someone or in general or what?
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> Is this supposed to be informative towards someone or in general or what?
Yah , practically just trying to help out Halo CE users
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> > 2546678360738636;2:
> > Is this supposed to be informative towards someone or in general or what?
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> Yah , practically just trying to help out Halo CE users
Thank you for that
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> > 2533274931561871;3:
> > > 2546678360738636;2:
> > > Is this supposed to be informative towards someone or in general or what?
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> > Yah , practically just trying to help out Halo CE users
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> Thank you for that
Oh, well you welcome . I thought you we gonna be one of those guys who reply in an unjust manner but no , thanks for being a nice I appreciate that
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> > > 2533274931561871;3:
> > > > 2546678360738636;2:
> > > > Is this supposed to be informative towards someone or in general or what?
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> > > Yah , practically just trying to help out Halo CE users
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> >
> > Thank you for that
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> Oh, well you welcome . I thought you we gonna be one of those guys who reply in an unjust manner but no , thanks for being a nice I appreciate that
No problem!
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> Bungie updated Halo 1 PC in 2014 to support the 4K resolution, you just need to download the patch and install it and then you’ll be sorted.
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> Halo PC/CE 1.0.10 now available > All Topics | Forums | Bungie.net
Nice 2 year old thread bump. There’s already a Halo PC and Halo 2 Vista FAQ thread made. Let a mod lock this thread. Please check the date next time.