We can increase internet speed by 20 percent

Microsoft reserves 20% of our internet connection bandwidth for their updates. For changing this go to Start->Run. Type GPEDIT.MSC . Then select COMPUTER CONFIGURATION->ADMINISTRATIVE TEMPLATES->NETWORK->QOS PACKET SCHEDULER->LIMIT RESERVABLE BANDWIDTH. By default it is not configured. Enable it and make the 'Bandwidth limit (%)' to zero. This determines the percentage of connection bandwidth that the system can reserve.