My office currently has about 20 computers/laptops. Most are on wireless. We subscribed to 1.5mbps ADSL broadband from our ISP. Is that enough? We have been experiencing intermittent connections for the last few months, could it be because there are too many users to the network and hogging it? If so, is there any software that i can use to track real time the bandwidth each user on my network is using so that i can pinpoint that the moment that my network is down, it is due to overloading of bandwidth. Thanks!

Let me start with this. Any company computer on the internet is subject to data theft. The second part is easier. 1. Use wires. 2. Setup a good firewall. consider a pix or other device to limit any and all non-business data. 3. Use best practices on all systems to limit virus, malware, non-business applications. "Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10