ORA-00064 after changes processes, open_cursors in Oracle 10g Express

Hi,
I just run the following sql statements:
alter system set processes=400 scope=spfile;
alter system set open_cursors=5000 scope=spfile;
After restart my computer, I can't connect to the oracle and in oradim.log i see the following error:
ORA-00064: object is too large to allocate on this O/S (1,7999480)
Any idea why and how can i solve it?
Thanks a lot!

Hi,
Thanks for your help.
I just open SQL and insert the following statement:
create pfile from spfile;
and i got the following error:
SP2-0640: Not connected
when i try to connect using conn user/pass@XE i got:
ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor
any idea?

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