Dual Boot Virus Clearance. How?

I have a dual booted Mac Book Pro with Windows 7 and iOS, partitioned and running boot camp.
The windows side has got a virus; well I am 99% sure. Booting normally, I log in and get a black or white screen. After booting in Safe Mode it shuts down automatically no mater what I do.
The Mac side is fine; I am writing this from there. How do I use this side of the mac to scan aand clear the other partition of the virus?
I have heard its possible but cant seen to find out how to do it.

If you can not do anything in Normal or Safe mode boot, then only other options are listed here.  
http://windows.microsoft.com/en-US/windows7/What-are-the-system-recovery-options -in-Windows-7
I copy text from above. Assuming that you have no external Image backup of good OS, if  my ** or *** items below do not work, you can, selecting your Windows 7 installation CD/Media in boot from Mac's Option key menu, reinstall Windows 7 (update) to the space you put it to in bootcamp area. An update will preserve your data to
C:\Windows.Old folder. 
What are the system recovery options in Windows 7?
The System Recovery Options menu contains several tools, such as Startup Repair, that can help you recover Windows from a serious error. This set of tools is on your computer's hard disk and on the Windows installation disc.
                                                      System recovery options
Startup Repair (**Try this first)
Fixes certain problems, such as missing or damaged system files, that might prevent Windows from starting correctly. For more information, see Startup Repair: frequently asked questions.
System Restore (from RestorePoints created by Windows Updates)
Restores your computer's system files to an earlier point in time without affecting your files, such as e-mail, documents, or photos.
If you use System Restore from the System Recovery Options menu, you cannot undo the restore operation. However, you can run System Restore again and choose a different restore point, if one exists. For more information, see What is System Restore? and System Restore: frequently asked questions.
System Image Recovery
You need to have created a system image beforehand to use this option. A system image is a personalized backup of the partition that contains Windows, and includes programs and user data, like documents, pictures, and music. For more information, see What is a system image?
Windows Memory Diagnostic Tool (this won't help in your case)
Scans your computer's memory for errors. For more information, see Diagnosing memory problems on your computer.
Command Prompt (Running Admin level CMD: SFC /SCANNOW is rather complex)
Advanced users can use Command Prompt to perform recovery-related operations and also run other command line tools for diagnosing and troubleshooting problems.
Note (won't be true in your case)
Some computer manufacturers might customize the menu by adding or removing recovery tools, or including their own tools.
To open the System Recovery Options menu on your computer
1. Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer using the computer's power button.
2.***Try this if ** did not fix) Do one of the following: (You need to have Bootcamp as default here)
If your computer has a single operating system installed, press and hold the F8 key as your computer restarts. You need to press F8 before the Windows logo appears. If the Windows logo appears, you need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer.
If your Bootcamp has more than one Windows operating system, use the arrow keys to highlight the operating system you want to repair, and then press and hold F8.
3. On the Advanced Boot Options screen, use the arrow keys to highlight Repair your computer, and then press Enter. (If Repair your computer isn't listed as an option, then your computer doesn't include preinstalled recovery options, or your network administrator has turned them off.)
4. Select a keyboard layout, and then click Next.
5. On the System Recovery Options menu, click a tool to open it.
To open the System Recovery Options menu using the Windows 7 installation disc or a USB flash drive, or a system repair disc
If your computer's system is severely damaged and you can't access the (F8) System Recovery Options menu on your computer, you can access it using the Windows 7 installation disc or a USB flash drive, or using a system repair disc if you created one earlier.
To use this method, you need to restart (boot) your computer using the disc or USB flash drive.
1. Insert the Windows 7 installation disc or USB flash drive, or a system repair disc, and then shut down your computer.
2. Restart your computer using the computer's power button.
3. When prompted, press any key, and then follow the instructions that appear.
4. On the Install Windows page, or on the System Recovery Options page, choose your language and other preferences, and then click Next.
If neither the Install Windows page nor the System Recovery Options page appear, and you're not asked to press any key, you might need to change some system settings. To learn how to do this, see Start your computer from a Windows 7 installation disc or USB flash drive.
5. If you are using the Windows installation disc or USB flash drive, click Repair your computer.
6. Select the Windows installation you want to repair, and then click Next.
7. On the System Recovery Options menu, click a tool to open it.
Note: after a Windows 7 install you should have Firewall settings limited to Core Networking.
It is also not a bad idea to disable Remote control of your OS in Control Panel->System->Advanced System Settings->Remote Tab
The first thing you should do is download Security Essentials http://windows.microsoft.com/en-us/windows/security-essentials-all-versions unless you have to run Bootcamp driver updates to make your computer work. In Windows 8 you do not need this.
P.S. You can learn more about Windows 7 by topic here:
http://windows.microsoft.com/en-US/windows7/products/features/windows-essentials

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    First of all you have to create an second partition in Vista. This could be done in Disk Management.
    Then I installed Win XP on the second partition. But after the XP installation I could not start Vista because Vista boot manager was damage by Win XP.
    To fix this I have used a original Vista disk (not recovery disk). I booted the Vista DVD and this has repaired the Vista boot manager. In Vista I have installed EasyBCD.
    EsayBCD is a small tool which helped to add the Win XP to the Vistas boot manager.
    After new reboot Vista and Win XP appeared in the boot manager and I could choose between both OS.
    I think you will need the same procedure using Win 7

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