Will be starting a small graphics design firm soon, with 20 employees. Therefore need software to manage the network. Have bought a bulk license of Windows 7.

I have a spare computer which can act as a server if necessary, but its an ancient Dell machine (Pentium-III). If required I would purchase an extra machine, but would like to avoid unnecessary costs at start up.

Following are the main functions that I would like to perform:

• Need to monitor\control network traffic and internet usage, restrict access to certain websites
• Alerts when access to certain software's, and when trying to tamper with privileges
• Ability to view desktops of any computer at any given time
• Limit access to certain hardware like USB ports,etc
• Limit access to folders on the computer
• Log/Report of all actions including keystrokes performed on any computer
• Local Network chat and talk client
• Collaboration and Work logs

Any Software available to do all of the above and also any additional hardware required besides network switches, network card's and CAT5e cables. Any other recommendations besides the above mentioned hardware setup