There are 2 problems with Vista and they both are related to the system restore. Heres one answer from another forum.
[QUOTE]1. Click the start menu
2. Click on All Programs, and then Accessories
3. From the accessories menu, right click on Command Prompt and select “run as administrator”
4. Type “vssadmin list shadowstorage” into the command prompt
5. The results should tell you the amount of storage used and the maximum amount alloted
If you’re not happy with those numbers, here’s how to resize them. Keep in mind, you will lose some older system restore points when you do this.
1. Repeat steps 1-3 to get bring up the Command Prompt
2. Type “vssadmin Resize ShadowStorage /For=[your hard disk]: /On=[your hard disk]: /MaxSize=[how much space you want to allocate]”
3. For example: “vssadmin Resize ShadowStorage /For=C: /On=C: /MaxSize=2GB”
4. You should get a message saying Successfully resized the shadow copy storage association, and you should have more free space on your hard drive.
from
http://keznews.com/2..._System_RestoreSRX660