For those who are interested in having control over bandwidth(internet speed) under windows a couple of working (tested with 95/98/ME/NT/2k/XP/Vista/Seven) solutions are :
You can use Net Limiter. Its a great software.its an ultimate internet traffic control and monitoring tool designed for Windows. You can use NetLimiter to set download/upload transfer rate limits for applications or even single connection and monitor their internet traffic.
Along with this unique feature, Netlimiter offers comprehensive set of internet statistical tools. It includes real-time traffic measurement and long-term per-application internet traffic statistics
There are 3 NetLimiter editions available, Pro, Lite and freeware.