Hi
U need to check few things for me ,
1. When is the system freezing , on a particulr software or a game .
2. Hard ware sspecs for the system and how much RAM is installed on the system
**** This can be a hardware issue or an issue with windows , first lets isolate it before we jump to conclusions
Check for error in windows, how is the system freezing , is it giving an error message , is it happening when the system is on net .
Incase of hardware this can be a number of components , let me know all this we can fix this . It is good that the system is unning at normal temp , reformatting hard drive does not mean that the issue is not with windows , it can be a program u instaled that is running in the background in windows .
3. Is the system running normally other wise or is it running slow
This issue wil take time ttoo fix , u can PM me as well