And you've had this system for how long?

You think maybe we should reformat the HD? Reinstall windows and software? At this point id be willing to bet this solves your problem, because its clearly not your hardware.

By repair i hope you don't mean deleting. Deleting registry files is a bad idea, redundant ones cause no issues whatsoever, and can cause **** ups if you do.

Use something like Ccleaner to remove remnants and unused registry entries and files safely.

The one i own is the best one in that regard. Obviously a K version for overclocking.

BUT, i am amazed that no one has mentioned that L4D2 should have zero problems running on that system. I can run that shit on a dual core from 09 with a damn 610 in it, without issue. We're not talking the new Assassins Creed here guys, we're talking about L4D, one of the best optimized and easiest to run on 10, 13 year old systems. The game does not even break 3GB Ram usage and any DDR3 should be fast enough for it.

when's the last time you reformatted?

Yeah six core 8th gen intel or wait for AMD's new 6 core processors that are due to release sometime near February. Quad is technically lowend but for his needs i don't see a modern 4c/8t CPU giving him any issues in the foreseeable future (hell my 5 year old quad core still runs games at max settings while both recording and streaming).

With the consoles using such weak CPU's, I could easily see a current generation quad core lasting another 3 or 4 years with no issues for most users.

I will strongly suggest getting 6 cores on your CPU. 4 cores have been mainstream for very long. It is getting kinda low end.

@skrydis: When you say you did error checking , did you run a chkdsk /r this will get you the most out of a check disk.

The 8th generation intel CPU's he was referring to are good choice (i3 8100, i3 8350k, i5 8400, i5 8600k). If you want to stay AMD then I would wait since there releasing new processors in February that are going to fix the only two major issues people had with the Ryzen series (those two issues being low clockrate and memory compatibility). No point in buying a Ryzen chip now when there replacement is due in the coming weeks

@skrydis: That whole computer is a bottleneck. I would start with upgrading the board/cpu/ram to either a ryzen 1600, or an i7 8400/8600 depending on budget.

You'll at least be able to run games smoothly, albeit a low resolution/details for now, and can upgrade the GPU later.

your whole computer is a bottleneck... is your HDD in healthy condition? might want to run a repair on it and defrag just in case.

@skrydis: i3 or i5 from the 8th generation from Intel... Or Ryzen... 1600.

The i3 8th gen is 4 cores, i5 is 6 cores. Or get a Ryzen 6 core. DDR4 ram on both platforms.

Unless you find a CPU supported by your mobo for next to nothing, I would consider that a waste of money.