XPS m1530 Problem with ethernet

Hi,

I own an XPS m1530 running Vista. Recently I've noticed that my I am unable to connect to the internet via my ethernet cable. My wireless internet is fine. I have tried different cables that I know to work, so it must have something to do with my computer. I've tried reinstalling my ethernet controller driver - Marvell 88E8040 10/100 Ethernet Controller from this website,

http://support.dell.com/support/downloads/download.aspx?c=us&cs=19&l=en&s=dhs&releaseid=R167854&SystemID=XPS_M1530&servicetag=<ADMIN NOTE: Service tag removed per privacy policy>&os=WLH&osl=en&deviceid=15608&devlib=0&typecnt=0&vercnt=1&catid=-1&impid=-1&formatcnt=0&libid=5&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=227515

but that hasn't worked either. Any suggestions as to what my problem may be and how I can fix it?

Thanks