When I open lo mac i get runtime error. I try to download vcredist_x86 but it doesn't help.
My specs:
2.0Ghz processor
512 mb ram
512 video
windows xp sp2

Please help

I think LOCK on is forcing your computer to commit hara-kiri. That's some old, weak stuff you have there (other than possibly the video card, need model)

You'll need at least a gig of RAM. Then- you'll have to turn down the settings A LOT if you hope to have a prayer of that CPU keeping up.

Hope you've cleaned & dusted the case out. It might catch on fire.