Question

I Believe that your game was created by UBISOFT.

You may have a copy protection conflict. Many games use EXTREMELY aggressive and harmful anti-piracy measures,
that often conflict with other games and software.

In fact many of these products, such as STAR-FORCE
used by UBISOFT up to two years ago behave like malware
to deliberately damage or replace Windows device drivers,
to cripple the CD ROM, and to hide like rootkits.

STAR-FORCE was the worst of the worst and it was classified
as a root-kit, that is why UBISOFT abandoned this protection
scheme a little over a year ago, due to a massive public outcry.

There may be a patch for your problem from UBISOFT, check this web link:

http://www.ubi.com/US/Downloads/Info.aspx?dlId=3

They seem to list your problem as one of the fixes,
near the bottom of this page

Good Luck, Martin