My wireless adapter will not hold a connection.

Hey. My wireless on my computer won't hold a connection for any longer than 30 minutes. I've checked the drivers, the wireless router, and scanned for viruses (several times) but nothing seems to work. In the last three months, I think I only had one occasion where the connection remained stable for longer than an hour. It doesn't matter what router I use or where I am. It has to be my computer. Any help?

I have a Compaq Presario CQ57 and I have had it for about 6 months.

I think the easiest way to test this would be to have someone else come over and try connecting to your wireless signal. If they can stay connected for a while with heavy usage, then it would relate the problem to your computer. As another effort though, you can always change the bandwidth that your wireless signal is on and see if that make a difference.