A Required CD/DVD drive device driver is missing (Windows 7 installation Solved)

A Required CD/DVD drive device driver is missing. How to Fix?

Installing Windows 7 using a DVD ROM is very easy. But when you use USB Flash drive as the installer disk, some errors can occur. The error 'A Required CD/DVD Device Disk Driver is Missing' is the one main error. This can occur sometimes if you use an out-dated windows installation media on a new model laptop or desktop computer. 

Solutions:

1. Unplug the USB Flash Drive and Plug it again. Then continue Setup. Probably this will fix the problem. If not, try the second method.
2. Download the proper chipset driver that include the ACHI  Controller from the motherboards manufacturer's website. If you are using Intel chipset motherboard, you can download the files given below. If this not working, you can download the appropriate chipset file from your computer manufacturer's support page.

For 64 bit Windows, Download this file.

Fix: User Profile Service Failed the Logon - User Profile Cannot be Loaded (HD)

Method 1:
Start Computer in Safe Mode by pressing F8 during POST (Startup)
1. To fix the user profile, click Start and type regedit into the search box and press Enter.

2. Registry Editor will launch and you need to navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
3. Find your user profile by clicking S-1-5 folder and double-click the ProfileImagePath entry to find out which user account it relates to. (If your folder name ends with .bak or .ba follow Microsoft's instructions to rename them.)
4. double-click RefCount and change the Value data to 0 and click Ok.
5. Now double-click on State and make sure the Value data is again 0 and click Ok.
6. Close regedit and restart your PC. You should now be able to log into your account.

Method 2:
1. Boot into Safe mode by pressing f8 during restart.
2. Open Control Panel and click User Accounts and Family Safety. Click on User Accounts.
3. Click Manage another account.
4. Click Create a New Account and type Account Name and Select Administrator
5. Restart computer and logon to new user. Copy old user files (desktop,my documents,pictures,videos etc) from c:\users folder to new User folder.