How can i fix my IBM thinkpad 600x tupe 2645?

my uncle went over to hong kong and was throwing out this laptop, i found it and he gave it to me. the only problem is that when i turn it on, it starts up with the normal screen saying, IBM Thinkpad,and then the very next screen comes up with this securety block in which you halfto enter your password, you only get three goes and after that it disables the key board so you cant type, so you must turn off your computer and back on again to try again, you cant get arround it to my knowlege. can some one help.