Playing at university shouldn't have had any effect unless they enforce any addtional security software on your computer?
If you Start > Programs > Postgres > Start Service then look at Task Manager > Processes do you see any postgres.exe processes?
Please select the last few files in C:\Program Files\PostgreSQL\8.3\data\pg_log (they're dated so just pick the recent ones), right-click and choose 'Send To Compressed/zipped Folder', then attach the zip file to a ticket on the
Support system, and link to this thread in the reference field of the ticket so that we can investigate.