Pirated Windows 7 leads to malware, botnet
Is your copy of the Windows 7 RC a legitimate one? There have been articles in the Washington Post, eWeek and other outlets about infected, pirated copies of Windows 7
If you got your copy from a non Microsoft outlet, please download the RC from https://microsoft.com/springboard, wipe your machine and reinstall.
For more info on read this piece here: https://blogs.zdnet.com/security/?p=3370&tag=nl.e539