Wireless Connection Keeps Going On & Off

I'm using a dlink network adapter(6 months old) on my pc, have always
gotten an excellent signal. Main pc in house is hooked up to dir-615
router & works fine. I had some bsod's recently & decided to
reformat xp. I did a reformat back in july because of a bsod from avast antivirus & had no problems till now. An xp repair didn't work this time. Loaded the driver for the adapter, got an excellent signal,
but couldn't access the net. The signal shows 4 green bars for about 20
seconds, then all white bars for a few seconds, then back to green. It
keeps dropping the signal over & over. The network card shows its
working properly. I did an ipconfig, and it says "media state
disconnected" & shows no addresses. It has to be some setting somewhere in the pc thats not right & not the adapter thats the problem. The reformat went fine, loaded all the
drivers in the right order. I only have IE for a browser which i need
to access the net with to load firefox & all other programs plus
service pack 3 & other xp updates back on with. When i loaded the
driver for the dlink adapter, i used a different workgroup ame than the
network name originally used to set up the dlink router if that means
anything. I can't figure it out. Any help MUCH appreciated.

 

Hi,
Can you connect the problem PC to the router with an ethernet cable to see if you can get a stable connection that way?

The icon that gives you the 4 green bars ......if you right click on this and select repair .....what is the result?

Start ......type in .....devmgmt.msc .....ENTER
Click the + next to Display Adapters
What is listed?
Are there any yellow exclamation marks or red Xs ?