[can not open web browser after computer sit idle]

if computer sits idle for any length of time I can not open firefox web browser

 

 

 

Operating system:Windows Vista Home Premium (32 bit) Service Pack 2

System root: C:\Windows

Available physical memory: 2036 MB

CPU: Intel® Celeron® CPU 420 @ 1.60GHz

Drive Info:

C: 931.51 GB

Internet Explorer: 9.0

[cannot pull up homepage]

cannot pull up homepage

 

 

 

Operating system:Windows Vista Home Premium (32 bit) Service Pack 2

System root: C:\Windows

Available physical memory: 2036 MB

CPU: Intel® Celeron® CPU 420 @ 1.60GHz

Drive Info:

C: 931.51 GB

Internet Explorer: 9.0