http://www.killerkip.be/gtavcfaq.htm
Vice City FAQ
Q: The mod installs just fine, but when I load my saved game, there are no pedestrians - and no cars.
A: Some people have problems when using the limitadjuster. The most common problem is the absence of pedestrians and cars in the streets. Just exit the game, open limitadjuster again, and decrease the streaming memory value. Just do it 5MB at a time or so, and get back into the game to see if there are peds. If there are still no people in the streets, exit the game and lower the value again. Keep repeating this procedure until the peds return. However, do not go under 45MB.
Alternatively, you could use this gta-vc.exe or the gta-vc.exe that skatehead made for his mod.
(links voor gta-vc.exe op link)
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