Tony draper, one problem (probably amongst several) of changing the date is that the AV (and probably some other programs) won't be able to update.
What AV do you use?
If Windows updated is turned on, hopefully the vulnerability the conficker (aka "Kido" ) exploits will already be patched.
For anyone infeted by this,
here is a tool by BitDefender that claims to remove it. (Haven't had to test this myself.)