Go to Acer's web site and download the user guide for your model. Then follow the documented procedure for restoring to factory settings.
When you've gotten your system back like you want it, I urge you to get yourself an external hard drive and a good 3rd party backup program. You can set it up to do everything automagically at the time and frequency of your choice. 1 TB external hard drives are about $70 these days and a really good FREE backup program is the Easeus Todo Backup Free which you can download from
http://www.todo-backup.com/products/home/free-backup-software.htm . That can save you a lot of time and frustration the next time something like this happens. Sooner or later it happens to all computers for one reason or another.
I installed Windows 7 on Acer had vista. now there are about 8 programs installed. I have no recovery disks. I would like to find the Acer disks to reprogram back to the vista it had. The files or programs were put in documents /windows.old. I tried to transfer to computer hard disk driver C but had no luck. I don't know what to do. I have been looking for the disks to get Acer back to original. Just completely confused. I would like any suggestions.