Change all your passwords at the university. Go to Akka self-service.
Change the passwords of all the web services you use. Many people
save their passwords in the web browser.
Have you used any of these on your computer - change password:
Apple (iTunes), Google (Gmail), PayPal, eBay, Spotify, BankID
If you are using SSH with public key authentication without
password (you should not), you have to remove your old public keys
from the servers where you use this authentication. (If you do not
know what SSH is then skip this step.) Create new public and private
keys for your new computer.
Order new computer. Contact Local IT to borrow a computer while
waiting. (Usually there are some old computers around. For example
BMC-IT has plenty of old stationary PCs with Core 2 Duo, 3 GB RAM,
mechanical HDD and 19" screens.)
Remove computer from inventory at department by marking it as
stolen. This requires a copy of the report to the police.