Dell Inspiron 1525 :: Windows Vista - Internet Stops Working After Few Minutes

After connecting to the internet on my laptop(Dell inspiron 1525, Windows Vista), the internet connection will work great for 5 minutes or less than it slows down drastically or essentially not working at all.  If I disconnect and reconnect it will work again but just for a short amount of time.  The wireless connection works great on other laptops, tablets and mobile.  I have Mcafee antivirus, and it could not detect any malware or viruses. Tried restoring the computer to factory settings and the internet stays connected for what seem a few minutes longer.