Wextract cleanup is a valid Windows process used for cleaning up files created by installers. It will run once on boot after a program installation.
Does your system meet the minimum requirements?
* Multimedia PC
* Pentium 233-MHz processor or better (500MHz recommended)
* Microsoft Windows 98, Windows 2000, Windows Millennium, or Windows XP operating system
* Minimum 64MB of RAM (128MB recommended)
* Up to 50MB of hard disk space needed to install — after install, up to 15MB may be needed
* 256-color VGA or higher resolution graphics card (SVGA recommended)
* Minimum 800x600 screen resolution
* Microsoft® Internet Explorer version 6 SP1 or later must be installed on your computer, though it does not need to be your default browser
Just a thought.