Im not part of the team but I may be able to help, I had the problem where it use to crash 10mins or so in game, but now I can play 1hr+.
First make sure you downloaded all the requirments:
http://www.microsoft.com/en-us/download/details.aspx?id=30679
https://www.microsoft.com/en-us/download/details.aspx?id=30653
https://www.microsoft.com/en-us/download/details.aspx?id=35
https://www.microsoft.com/en-us/download/details.aspx?id=5549(Games for windows live update)
Make sure your running it as a admin
Turn of your anti-virus, some anti-virus mess with LCPDFR, LCPDFR is not adware or malware.
Turn down your graphics. I know its a huge sacrifice, but most computers you have too... not all the way, but a fair amount.
If you have any other mods try to limit how much mods you have.
If you have any other version of LCPDFR please delete them.
Heres a big one, download this
http://www.techpowerup.com/forums/threads/large-address-aware.112556/
And select the launchEFLC or something like that in the GTA IV main directory, and after that, click run. Next select the shortcut you have if you have one on your desktop
Try not to have lots of ELS cars, or even plain cars that are modded. Modded cars take up lots of recourses.
For me, when i went to the GTA IV graphic options, my limit was like 240 or something like that and LCPDFR crashed alot, then i found a 4GB memory card and inserted it (Now i have 8GB) and my limit was 470 and LCPDFR did not crash
There are more solutions, but i think most of these will solve your problem
If you problem still exist after these solution please respond.