I have been trying to render a 10minute video to a wmv file with the default template. It says the estimated size should be 46.06MB.

When it starts converting, it works fine, however after it gets to about 2% it freezes. It will start again but then after a few seconds freeze again. It keeps doing that and the estimated time keeps increasing from one hour to up to 18 hours and never finishes. Ive tried converting it many times but it still doesnt work and im not sure what to do. it does the same thing for other videos too. This never used to happen before and I'm not sure whats wrong. Could someone help please?