I can't delete the MS AntiSpyware installer from my desktop. It says the program is in use by another program. I've tried rebooting and closing everything down, even killing as many processes as I could. It's been on my desktop for a month now and gone through several re-boots and attempts to delete.
Here's the funny thing, I don't know if this has anything to do with it or not, but I didn't download it to my desktop. I d/led it at work and emailed it home as an attachment and then d/led from my yahoo mail acct.

I know this was silly as you have to download MS product installers onto the machine you're installing on, because of how they test your computer and stuff, confirming you have a genuine licensed copy of the OS and it tailor's it to your system. Anyway I didn't even try to install it at home and don't want to. Don't know if this has anything to do with why it won't delete.
Anybody know what to do? Thanks