The problem is totally weird. I spend half an hour downloading the bloody thing and when I run the installer, the initial progress bar gets to 3 blocks then goes back to zero.

"Weird" I thought, then tried running it with my anti-virus software off. Then again with my firewall off (don't worry, I ipconfig /release *'d first ). Still no luck.

If I watch it in the task manager's process list, it's memory usage shoots up and up and up... I haven't let it go higher than about 300 MB before I kill it.

What the hell's going on?
Oh and yes, I've tried downloading it again and tried installing previous version - no luck.