so dave ...

now I turned back all parameters and oracle works, but very very slowly , all users are very irritated.
My OS is MS Windows 2000 server - I think that in this version it can easy use 4 GB of ram memory. Server has 5 GB ( in BIOS is 5 ), but system can use only 4 GB.
my parameters are now:

open_cursors = 1300
db_block_buffers = 95000
shared_pool_size = 400000000
large_pool_size = 614400
processes = 350
log_buffer = 131072
db_block_size = 8192
sort_area_size = 5000000
sort_area_retained_size = 65536

and everything works but .... very bad !!!