i get an strange error on typing ctrl+alt+del (task manager) saying task manager has been disabled by ur admin. help me out guys
pls

is it your machine or is it just lent to you for work or school?

Assuming that you are an Administrator you can do the following:

http://windowsxp.mvps.org/Taskmanager_error.htm

Also note that this behavior, if not applied by an administrator, is often Malware or Virus related.