Every time I don’t use the computer for at least 20-30 min. or more,websites won’t load. Or it will say"connection timeout",page error". What I always have to do is restart the computer in order for it to work correctly! I could be online for 8 hrs. straight,but if I leave the computer alone for a while then get back on,it gives me that same problem. I have ran scans,CCleaner,registry cleaner,but nothing prevents it from not happening. It has been doing this for a while now!

I have Windows XP desktop. I have plenty of memory. My idle is set to 30 min. Any help would be appreciated..