Problems connecting to web w/ Sony Vaio

Hello,

I just recently purchased a Sony Vaio laptop and can't seem to keep a web connection. Have a linksys WRT54G router and it will not hold a wireless connection. Will not connect with an ethernet cable at all. Went and bought a Belkin router but it had even more problems than linksys so took it back. I can connect using my work (HP) laptop. Seems to be a conflict w/Vaio. Best Buy geek squad said they never heard of this problem. Anyone out there have any suggestions?