Wow, that's a nasty problem...try to uninstall from Programs and Features the things you don't need and then using a lot of patience open a document and something and copy/paste to Start=>Run "msconfig". From the startup tab try to uncheck the boxes in front of the things you know of and don't need in the startup. Restart and see if it works.
By the way...how did you managed to open this post if you can't write on your pc?
kidding