how to intall modem?

It depends on the modem Internal/external and the modem's software.

If you mean an internal modem then go to www.lenovo.com and download a manual for your ThinkPad.

If external read the modem's manual.

If any of this doesn't make sense or you need to know more post a NEW question (this will look closed) with LOTS more information about what you are trying to do.

T
February 2009