Wireless Connection randomly disconnects

Hello,
I am working on my wife's HP netbook. She recently was infected with the Antivirus Life malware and I used the step by step guide to remove the infection. Now we are running into a problem with the wireless connection. It is randomly disconnecting. I have Verizon fios and the 9100EM wireless router. Prior to a week or two ago, this never happened. I am thinking that this may be related to the malware previously experienced. As this is my wife's school laptop, I (we) would greatly appreciate your help. Thanks in advance. Brandon

 

Sorry, I forgot to mention that she runs Windows XP.