I see nothing unusual or wrong in the screenshot. 50% memory usage is not unusual on a system with 2 GB RAM, particularly when there are 5 chrome processes running.
You have to understand that memory management in Windows (or any modern OS) is highly dynamic. The memory manager maintains control over application and system memory usage, always with the goal of maximizing performance. Minimizing memory usage is not a goal. 50% usage with little running might seem high but that is only because there is currently no better use for the memory. But open a large application and this usage will be trimmed back, drastically if necessary. This is as it should be. Unused memory is wasted memory and Windows hates waste. Considering that there is only 7 MB RAM free it appears that Windows is doing a good job.
The commit limit is 3673 MB. It will be the sum of the size of the pagefile plus the size of RAM, minus some small overhead. From this we can tell that the pagefile must be something more than 1536 MB. A system managed pagefile would make it about 2 GB. If pagefile configuration has been changed, particularly if it is a fixed size, that could be a problem.
This is not to say you don't have a problem. Just that Task Manager doesn't show it.