If I were you I would reset the router and reconfigure it, either through googling the how-tos, or by calling Linksys tech support. Assuming the router is also the modem, I would also call my internet provider @ search the right settings for my ISP on the internet.
Buying a new router would also requires you to do the above, especially if you are indeed using a modem+router device.
The most important thing to know is if your ISP connection is using ID and password. Ask your ISP first if you indeed requires one, and if you can retrieve it, which usually requires a lot of work.
Your best bet is actually asking the person who set it up.