Windows Task Manager

Hello,

Whenever i try to shutdown my computer is says that it is waiting for task host windows to close. I wait for about 5-10 min and nothing happens. The only way to shut it down is to do a force shutdown. Any help?

Thank You,

Specs
Windows 7 Home Premium
Hard Drive Capacity 320 GB
Processor Cores 2
Processor Speed 1.86 GHz
Processor Type:Intel Pentium Dual-Core P6000
RAM 4GB