what is the cost to transfer data from one computer to another and what do you need for the process.

Really, just take the hard drive out of the old computer and put it in the new unit. Problem solved cost free.

The last time I went, it was about 75.00 dollars and a second hard drive.

Bring. The tower and call the best buy near you for price

Yes, you need to take the old tower in, but you don't need to worry about any cables or the monitor. Geek Squad will use their own. Cost does vary depending on your specific needs, so calling 1-800-GEEKSQUAD will get you the most accurate answers for pricing before you go in.

Price varies

i understood you had to bring tower from the old desktop

Take Just the computers, not sure on $.

You may want to call the bestbuy that is close to you to find out for sure.