Question: Does Microsoft Virtual PC have any scripting capabilities? I'm trying to automatically launch a web browser inside the VM and have it go to url specified by a parameter.

Answer: 
For "basic" viruses you'll want to boot up in safe mode and delete the executable (you could use Process Explorer, or task manager from Vista onwards, to locate the file), but for more advanced types I always find using Sysinternal's Autoruns to remove their ability to start up (along with any helper applications they have) does it. Anything that lives through that might take a little more poking to fix.
My advice would be not to search on Google directly for the executable, but rather to Google for a reliable anti-malware site (e.g. your antivirus vendor, or the other big ones like Symantec etc), then search within their site to see if it's a known issue.