My Inspiron M101z which I bought last year is supposed to have 802.11n wireless support. However, my wireless speed never exceeds 72.0 Mbps no matter what I do. My router is Linksys WRT160N v3. I've tried everything, setting mode to N-Only, setting channel width to 40Mhz. The result is always the same, I'm getting 72 Mbps max. This speed makes difference when transferring files between computers in the network. All my computers are running Windows 7 x64. Any ideas why it doesn't get faster or how to fix this issue will be appreciated.