If you're still using the CD-ROM system, you're out ... Starting with Windows Vista, the U disk can already be used to start the machine and install the system.
Before making a bootable USB drive, you need to:
A USB drive, preferably 4G or greater
A Windows 7 or Vista CD
A computer that is running Windows 7 or Vista
Then follow these steps:
1. Connect the USB disk to the computer
2. Open Administrator-mode command line (Start menu-> All Programs-> Attachment-> command Prompt, right-click, select "Open as Administrator")
3. At the command line, enter the following command (in bold):
A.diskpart (enter DiskPart tool)
B.list disk (list all disks, where you can see the information of U disk, usually the last one)
C.select Disk 1 (select 1, where the number ' 1 ' needs to be changed according to the actual situation)
D.clean (clears the partition information on the disk)
E.create Partition primary (create a primary partition)
F.select partition 1 (select the partition you just created)
G.active (Activate this partition)
H.format Fs=ntfs Quick (Quick format disk)
I.assign (assigns a letter to this partition)
J.exit (exit DiskPart tool)
4. Now in the resource management can see the new U disk of the split drive
5. Plug the Windows 7/vista CD into the optical drive
6. Copy the contents of the CD to the U disk