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[Denti]

Running Vista with 6gB memory. Intel core2 @2ghz

Video card is ATi Radeon 4500

I'm getting an error using Red October HQ but don't know how to read the report to fix it, if possible.

[Matt]

I don't think anyone at JRiver knows.  The log is a madshi creation.  If it doesn't work, just use Red October Standard.

[BryanC]

Video card is ATi Radeon 4500

There's no way that card can run Red October HQ.

[Denti]

There's no way that card can run Red October HQ.

Got it. Thanks!

[Denti]

I also have an ASUS 7300GT   
256M

I forgot which is supposed to be better. If I switched this one in would it support MadVR?

[BryanC]

No, ROHQ requires a lot more video card horsepower. You'll need something with gddr5 memory at least.

[Denti]

like this?

http://www.amazon.com/EVGA-GeForce-1024MB-Graphics-01G-P3-2632-KR/dp/B008RIEOBS/ref=sr_1_1?ie=UTF8&qid=1407759440&sr=8-1&keywords=video+card+gddr5

[mattkhan]

like this?

http://www.amazon.com/EVGA-GeForce-1024MB-Graphics-01G-P3-2632-KR/dp/B008RIEOBS/ref=sr_1_1?ie=UTF8&qid=1407759440&sr=8-1&keywords=video+card+gddr5

The usual basic recommendation for a good madvr card is a gtx660 (eg http://www.amazon.co.uk/gp/aw/d/B0098VKIRC/ref=redir_mdp_mobile?ref_=pe_385721_37038051_TE_dp_1). The 750/is another option (possibly a bit less horsepower but cooler/quieter)

It does depend what settings you are trying to use, what the source is and what display you have though.

[Denti]

Lots of 720 and 1080p material. Old HTPC running Vista. Should have the power. Display is a 46" LCD.

[6233638]

While you can get madVR working on lower-end cards like a GT630 - I've had it running on a GeForce 9400 and a GT610 - if you're buying a new GPU for it, I would not recommend anything less than a GTX 750. (and I'd recommend a 2GB card if you can afford it)

Using a lower-end card with madVR is only going to let you use the basic scalers, rather than the more advanced ones.
Those are still worthwhile - there are more reasons to use madVR than just the scaling algorithms, but if I were buying a GPU for it, I'd want something that can handle some of the more advanced options.
 
madVR is not a "standard" video renderer - it uses the GPU shaders to perform advanced scaling and processing, which is why the requirements can be so high.
I don't think even a GeForce Titan Black, or an R9 290X can handle it at the highest quality settings - but there are settings which give you 90% of that image quality at a fraction of the performance requirements.