LAN woes, please help.

i am connected to a 100mbps cable network and initially all was well as everything was running smoothly but now i get about 70 network attacks per day(LSA exploit me firewall says,to the death of me i dont know what it is) and the internet is extremely slow ,what i want to know is that is there any way to find out if my network administrator is deliberately restricting bandwidth to certain users ?

http://rusecure.rutgers.edu/secure [...] asures.php

Read this and it'll tell you what to disable and what to do to prevent this. You may want to consider picking up a router to block those ports which would take the lag off your computer. You can also hide your WAN IP address from the outside which may help in reducing attacks. A router runs about $50.