Hi there !
1) Can you check the ping of the SQL Server from the Win 7 Bit machine ?
2) Do a telnet and see if the port is open ?
3) Disable the firewall in the win7 and check.
Thanks for your answer
Yes.... I did all of this tests and works well
It works fine in all other computers with Windows XP 32 bits
Only in it computer doesn't work
Are you using SQL Server Service Pack 2.0 ? If not please upgrade the SQL SP 2.0 as i was installing the SQL Server 2008 on a Win 7 64 bit machine it said there were some reported problems with the Win 7 and SQL Server 2008 and it had advised me to download the latest service pack that is SQL Server SP 2.0.
I hope this helps.