my game always crahes/shut down when i enter this map..i duno why but it just happend a week now..? help me..please

If it is only that map, you likely have a corrupt file somewhere in that map folder.
If you have a friend with Vegas 2, you could copy his oil folder to your computer.

It would be found here except yours is probably installed on C:
(My oil folder is 98.8 MB)
D:\Program Files\Ubisoft\Tom Clancy's Rainbow Six Vegas 2\KellerGame\CookedPC\MapsBishop\Mb04_Oil

Save yours to another location first as a backup just in case!

Hope that helps!