At least I amnot alone!
Bought Dell Inspiron 530 for my son for Xmas. PC is fine but will not connect to internet via wireless. Connects as it should but shows 'limited connectivity' so no access to internet. Works fine with ethernet cable to router. I have three other PC's all connected wirelessly but all running Windows XP.

I have replaced the wireless card, hooked up another router as well, no different. Spent two hours on phone with Dell technician, ended up restoring system to 'factory image' as suggested by Dell, lost all the loaded files etc. but just the same. Vista is a joke and wish I had now specified XP when I bought it!