looks like its a driver issue of the graphics card for WIN7 and 2k8 R2. Not a motherboard issue.
please contact a VGA vendor (NVIDIA/saphhire).
The above friends, you test it? You use S5520SC motherboard to install win2008r2 or win7, successful? If successful, it proved to be video card problem, but I also have no video card installation problems, so it is a motherboard problem determination.
Through my efforts and research to finally resolve the issue on hold. Problem is in the card, download the latest network card drivers, the problem is solved. Just begun suspected bios, audition for a long time problem is still there, and then think I may win the system to start and services, tested many times, it is not resolved, finally, was found into the safe mode, no problem, it is believed that card, download the latest network card drivers, the problem is solved.经过我的努力与研究,最终解决了停顿的问题.问题出在网卡,下载最新的网卡驱动,把问题解决了.刚开始怀疑是bios,试演了很久问题依旧,然后想可能是win系统启动与服务,试验了很多次,也没有解决,最后,发现进安全模式,没有了此问题,所以怀疑是网卡,下载最新的网卡驱动,把问题解决了.