Belkin Wireless Router F5D8233-4 shotty connection missing wireless

I got home from college back in ealry Summer to find my Linksys router to have utterly failed. Couldnt connect to it from my Dell XPS laptop wirelessly or via ethernet. We figured the problem to be Linksys blow and die easily, least from what i hear. Bought a belkin N wireless router to fix the problem. Set it up on the PC its connected to set up the password and everything. It seemed to work but soon the wireless signal LED turned off, password protected, modem connection, internet connection and power stayed nice and blue. Tried everything i know how to try and find my network on my laptop, It never shows up on the main menu of networks to connect to (using Windows XP since vista blows like linksys) but in some of the other menus that find all networks possible, but no option to properly connect to it.

Surprise surprise. Trying to make the last sentence make more sense, my network popped up and it connected to it. Only half the problem though, The connection will randomly drop. The box tells me that it either doesnt have internet connection or no modem connectivity. The latter of which is harder to fix, usually taking ~10 minutes of pulling power cords to reset the modem and router. I've talked to a belkin customer service agent unfortunately shipped over seas to India. I could tell through his questions hes pulling questions off of a computer screen and plugging in key phrases from what i tell him. Belkin is of no use for support and i use Comcast digital cable and i know from other occasions they are infamously bad with customer service.

Who should i be threatening with violence? (kidding) the fact linksys and Belkin had similar problems leads me to believe Comcast is to blame, but could a horrible connection from them cause the wireless to fail?