1. General way (which is also the simplest one)
1) Decompress the download ISO file to a drive; notice the drive is not the one you intend to install Win 7 system on.
2) Double click the decompressed setup.exe file, and follow the direction to install.
2. Image installation with virtual CD-ROM (general installation method)
1) Make ISO file with Damon Tool
2) Double click setup.exe in the image folder, and follow the direction to install.
The two methods above are the general ones that you are familiar with, which are also very reliable installation with less chance for accident. But there’s one defect, that is, it takes a long time. If the time for update and application software installation is counted, afterwards, 1 hour is at least.
 And the next few methods below are non mainstream, but one of the biggest advantages is that the consumed time is greatly shortened. Someone tested that it only takes about 17 minutes to install a complete system (not counting the time installing software after system installation)
3. Install under safe mode
1) Download Windows 7 7057 ISO image file, and copy to the disk except disk C with virtual CD-ROM (such as D:\7057)
2) Press F8 when start up—repair system—choose the last order repair—type “D:\7057\sources\setup.exe” to the command prompt;
3) Enter installation interface and choose Custom installation;
4) Choose to install language and format drive C before installation.