How long has you had the laptop?
If your laptop is less than 1 year old RMA, if not
After the first time you set it up it nags you to make the recovery disk.
If you go in bios does it see the HD?
If so you can try to boot from recovery partition (press alt + f10 after acer screen )
If not: you have to replace the HD and then reinstall windows
two choices there:
1- buy a windows 7 home (110$)
2- order acer recovery disk (50$)
+1 daswilhelm not related to comcast installation