Unusual URLs sent to IIS 5.0 server

[H Carvey <keydet89 () YAHOO COM>]

For several days, I have been seeing the 
following URLs (and similar ones) in my web 
server logs:

/Data/prev.+updates/2000/.+++t/.++++++
+++++++++++++++++++++++++++++
++++++++++damn/I+++++am+++++++
++++++++++++++++so/h+++++u++++
++n++++++g+++++++r+++y/-=ISOZ=-
/No_One_Lives_Forever-RAZOR1911/

and

/Data/prev.[1]updates/2000/.[3]t/.[45]damn/I
[5]am[23]so/h[5]u[6]n[6]g[7]r[3]y/

The response code is 403.

Can anyone tell me what this is?

Thanks,

./Carv