Wifi Briefly Drops
Forum TomsNetworking : Tell Us - Wifi Briefly Drops
Is your wireless network secure? If it is not secure, and you are located in an area where there's likely to be a lot of wireless internet traffic (ie. many neighbor computers), then there's your problem.
Possible Problem #1:
If you are using a laptop with both a built-in Ethernet adapter and a wireless adapter, you should make sure that the wireless adapter is disabled if you are in a dorm room (or house near many neighbor's). Your computer and someone else's computer are accidentally using the same IP address.
Windows Vista Computer
To disable your wireless adapter (which you must set under the computer's Network and Sharing Center):
1. Click Start.
2. Click Control Panel.
3. Double-click Network and Sharing Center.
4. In the left-hand column, click Manage network connections.
5. Right-click the Wireless Network Connection icon.
6. Click Disable.
To enable your wireless adapter (which you must set under the computer's Network and Sharing Center):
1. Click Start.
2. Click Control Panel.
3. Double-click Network and Sharing Center.
4. In the left-hand column, click Manage network connections.
5. Right-click the Wireless Network Connection icon.
6. Click Enable.
Windows XP Computer
To disable your wireless adapter (which you must set under the computer's Network Connections):
1. Click Start.
2. Click Control Panel.
3. Double-click Network Connections.
4. Right-click Wireless Network Connection.
5. Click Disable.
To enable your wireless adapter (which you must set under the computer's Network Connections):
1. Click Start.
2. Click Control Panel.
3. Double-click Network Connections.
4. Right-click Wireless Network Connection.
5. Click Enable.
Possible Problem #2:
Treat your wireless network as if it was a wired one. On the wireless client, add a printer from the Printers & Faxes window (in Control Panel) and for file sharing make sure you have Microsoft File and Printer Sharing enabled on the wireless clients' connection (My Network Places > Properties). Be sure to implement a method of security otherwise anyone within your wireless network range can gain access to your files. From the run box (Start...) type \\computer_name or \\ip_address and see if anything comes up (it may take a while). Also check that the wireless client and desktop computer can ping each other.
Possible Problem #3:
When you're using a wireless internet connection, and it is not secure, it is possible one of your neighbor's are taking advantage of your unsecured network. If this is the case, anti-virus or spyware removal software will not ultimately fix your problem, unfortunately.
If you want to find out if someone is stealing your internet, or if you just don't know, I'd suggest you try a free wireless network security scan tool, found here: http://www.purenetworks.com/securityscan
This will diagnose any issues you may be having, and if it is a intruder, you can permanently block them from accessing your internet.
For full disclosure -- I do work for Pure Networks, the creator of Network Magic. So If one of these three solutions does not help solve your problem, let me know and I'll see if I can find other solutions for the intermediate connection issues you're having. But I'm fairly confident one of these solutions should do the trick. 
in other to my knowledge, it could be from router or has conflicted between wireless card and some softwares u installed recently
reinstall OS as above directions>> [next replace router 
(almost 90%)] 
u also try to open wireless door on bottom case and check cable first ( try take it out and push it on )
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