Problems with I/O subsystem:

• Add more memory to your server. Try SQL Ultimate Performance Monitor plug-in called Memory Advisor to determine whether you should purchase additional hardware
  
  
  
  
  
  
• Upgrade your I/O subsystem
• Optimize your queries so they produce less I/O requests: Find them by SQL Trace Analyzer and Optimize them
       
  
  

SQL Solutions also offers remote DBA services.