The version of Oracle I am using is 8.1.7

My alert log says the following:

Thu May 03 00:07:11 2001
Errors in file D:\oracle\admin\tsdb\bdump\tsdbCKPT.TRC:
ORA-00206: error in writing (block 3, # blocks 1) of controlfile
ORA-00202: controlfile: 'C:\ORACLE\ORADATA\TSDB\CONTROL03.CTL'
ORA-27072: skgfdisp: I/O error
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 33) The process cannot access the file because another process has locked a portion of the file.

Thu May 03 00:07:11 2001
CKPT: terminating instance due to error 221
Thu May 03 00:08:01 2001
Instance terminated by CKPT, pid = 1728