Windows 7 - Installation Drive

I have vista installed on C drive, which is the primary drive, and windows 7 on X drive, which is a logical drive. On startup I am given two options of whether to login to the C or X drives. Now I have windows 7 installation files on X drive and I want to install windows 7 on C drive -- I am doing this because cd-rom on this laptop doesn't work. Would it be able to install or would it face problems? I have tried launching the installation file and it seems to accept C drive as the installation drive, but would it go through with it to the end or not? Any ideas?

If you have a USB Thumb Drive you don't need the DVD using this method.....

How to Install Windows 7 from USB Flash Drive

Requirement:
USB Pen Drive (Min 4 GB)
Windows 7 ISO (32 bit or 64 bit)
MBRwiz Download and Extract it on your hard drive (Diskpart utility for Windows XP doesn’t detect USB drive as Disk hence we need to use this free utility to make bootable USB drive).
1. Connect your USB Flash Drive to your computer Format USB drive
2. To Format [COLOR=blue ! important][COLOR=blue ! important]USB [COLOR=blue ! important]Flash [/COLOR][COLOR=blue ! important]Drive[/COLOR][/COLOR][/COLOR] Go to My Computer -> Right click on USB drive and select Format from context menu.

3. Now go to Start Menu->run->cmd (Open [COLOR=blue ! important][COLOR=blue ! important]Command [COLOR=blue ! important]Prompt[/COLOR][/COLOR][/COLOR]) and Type following command
convert i: /fs:ntfs (Where “I” is your USB drive latter)

4. Mount Windows 7 iso as drive (You can use Freeware MagicDisc download from here).
5. Type Start->run->cmd
Now dir to directory where you have extracted MBRWiz and run following commands

mbrwiz /list (note down disk number of your USB Pen drive)
mbrwiz /disk=X /active=X (X is Disk Number of your USB Drive)
exit

6. Now open another command window and type following command

J: (Drive letter of Windows 7 iso mounted with demon tool)
CD boot
bootsect /nt60 Y: (Y is drive latter of your USB drive )

7. Now copy all files from drive where you have mount Windows 7 iso
8. Now reboot your computer and press F9 to get your BIOS screen and select USB drive as your boot drive.
9. If every thing goes fine, Your Windows 7 Installation should start from your USB drive.

For a USB install take a look here:

USB Windows 7 Installation Key Drive - Create

I actually had the installation file on X drive partition and ran it from there.. it apparently copied the files to some mysterious place and installed on C drive just fine. It apparently deleted the vista and installed windows 7 on it. Works fine.. you can add this method to the list,, only if the installation file is on the drive I suppose or maybe not.