Reply #36: Usually it would only affect the Windows Partition...

[Solon]

There are exceptions, for example, the Master Boot Record could be affected by a virus, this is the menu that comes up to choose OSes, also another problem would be if Windows XP has full Read/Write Access to the HFS+ partition where MacOSX resides. If I wrote a Windows virus to wipe ALL harddrives on your computer that Windows Recognizes and can write to, then the Mac part of the system can be wiped really easily IF Windows can write to it. Now, there are solutions to this problem, like only allowing the Read Only access to the HFS+ partition(s), and Limiting Windows XP from any type of access to the MBR, etc. These are software solutions for software vulnerabilities in Windows.