Have you ever try to install Windows 7 but it did not complete the installation and stuck at Windows logo? When you try to boot into safe mode it stuck at system32\drivers\disk.sys? Worried no more, here's a solution to this issue! 
Problem cause by : pcmcia.sys file is corrupted
1)  Use the Windows 7 DVD to start the computer in Windows Recovery (WinRE).
2)  In WinRE, open a command prompt. To do this, follow these steps:
On the Install Windows screen, select the appropriate Language to install, Time and currency format, and Keyboard or input method options, and then click Next. 
 3) Click Repair your computer.
 4) Click the 7 installation that you want to repair, and then click Next.
 5) Click Command Prompt and type
cd windows\system32\drivers
and press Enter, then type
ren pcmcia.sys to pcmcia.bak
6) Restart the computer