Certain websites will not load, some programs will not download Tech Support

Certain websites will not load, some programs will not download

I have had an ongoing problem for about a month, I am using windows 7 ultimate 64 bit and IE9, though I have tried 32 bit and  Chrome and Firefox with the same results.
Some websites, even those I am working on though not all, will not load on two different machines, although and identicle setup on a third machine connected to the same router works perfectly, so I have discounted any router settings.  On one of my sites,
I cannot save edited content, though the 'third machine' works.  From a different site I can access everything normally.
I have reloaded windows7 with repair install, gone through every setting I can think of, duplicated every setting I can find from the machine that works, flushed the dns so many times the flush is wearing out. Done NBSTS -R  + - RR, NETSH INT IP RESET, and
WINSOCK RESET.  Tracert takes me to the nameserver in 31 jumps but sometimes reports not being able to resolve the target but not every time.  The site owners tell me they don't see any problems.
Sometimes if I leave the www.
off the address, I can see the site also when explorer reports 'Cannot display the webpage' I can plainly see the favicon on the url bar?
 This has become a challenge, I know I should bite the bullet and reformat both machines but I have invested so much effort into trying to clear this that I would sooner not.
Anybody got any idea I haven't tried I would welcome them, but don't be surprised if I answer thank you but done that!
 
Thanks
Jeff

Solutions to the Problem Certain websites will not load, some programs will not download

Download SmartPCFixer to Fix It (Free)

Open Action Center by clicking the Start button Picture of the Start button, clicking Control Panel, and then, under System and Security, clicking Review your computer's status.

Make sure your computer has at least the minimum amount of random access memory (RAM) required to run the program that is displaying the error. Look for the program requirements online or in the packaging information.

Recommended Method to Fix the Problem: Certain websites will not load, some programs will not download:

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1. Download Error Fixer . Install it on your computer.  Click Scan, and it will perform a scan for your computer. The errors will be shown in the scan result.

2. After the scan is finished, you can see the errors and problems which need to be fixed.

3. When the Fixing part is finished, your computer has been speeded up and the errors have been removed

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