Are you using a recording program such as Dxtory while attempting to open the ELS menu? If so that is the cause as I also cannot open it while using that program.

 

Regards,

Dylan - DCP1293

It may be that the light textures are showing up, not ELS, so it's possible that ELS isn't even working. And try ELS V6, that worked for me when ELS V7 was not working properly, if that doesn't work you're doing something wrong

Got it working after 2 reinstalls. What ENB is good with a low-mid end pc. (i7 and Radeon 5870)

Got it working after 2 reinstalls. What ENB is good with a low-mid end pc. (i7 and Radeon 5870)

 

I really like Game4Video's ENB - '?do=embed' frameborder='0' data-embedContent>>

 

I used it for a while but my PC doesn't really like ENB's

The Game4Video ENB is a good quality ENB that also make the ELS lights look very nice and crisp as well. Another tip, since you purchased GTA IV from Steam, if you open up Steam, go to your library, and right click on GTA IV, there should be an option to compress and back up your directory and what not. 

I reinstalled the whole thing and when I launch it it is just a black screen.

Game4video made my game go 15fps.

Game4video made my game go 15fps.

 

Same here, ENB's are meant for high end PC's, you can try a low end ENB. Just use: http://www.gta4-mods.com/misc/realityiv-20-f25401 it's a timecycle mod, not an ENB (no ELS effects though) and try disabling shadows and night shadows, that will stop lag (if you have it).