方案1

When PATH variable gets overloaded with too many values it reaches a point where you cannot add values anymore. Trying the following should solve your problem.

Solution 1:

Create a new system variable say 'NEWPATH'
Assign the bin directory location to 'NEWPATH'
Now append '; %NEWPATH%' to the PATH variable

If this still doesn't work then try to copy some part of PATH variable already existing values to the 'NEWPATH' and then append the 'NEWPATH'

Solution 2:

Check the value of PATH variable if you can group and shorten the paths. For example,

C:Program FilesMicrosoft SQL Server102ToolsBinn;C:Program FilesMicrosoft SQL Server102DTSBin;

can be combined to

C:Program FilesMicrosoft SQL Server;

In this way you can build more space into your fixed length PATH variable and finally adjust your bin directory location into PATH.

Hope this helps you!

方案2

There are few ways to clean up your path variable. The easiest is to use Rapid Environment Editor. This free utility will,

Remove the duplicate paths (right click > Cleanup Paths)
Remove non-existent folders (shown in red which you need to manually delete)
Replace long paths with short paths (right click > long to short path).

I do above steps in order and use 3rd step only for longest paths until Path variable size is in control again.

If you want to go more advanced, here's little C# tool that you can modify to whatever other logic you want to implement