No audio Device is installed red X on speaker

if this is a recent problem then try a system restore to before the issue started...

System Restore

edit : lightning fingers bill.

if you have your installation disc then try a repair install

Repair Install

if you dont have a disc then download an iso of your exact os
then burn it as a bootable disc, then follow the repair install tutorial i linked above

Windows 7 ISO x86 and x64 Official Direct Download Links (Ultimate, Professional and Home Premium) « My Digital Life

Fill out your system specs so we know what hardware you have.

If you don't have a CD/DVD drive, you should either have a USB stick with a restore partition on it, or you should have a restore partition hidden on the hard drive. Since you deleted files and you can't do a scannow action, I feel that's your only option at this point.

Well, yes there is a reason, you deleted a file. It was obviously an important system file. There should be a recovery partition that would return your PC to it's factory state, but you will lose your data and installed programs, so you would want to backup any data to a USB device before you take this route. On the following page, scroll to Restore the PC to its original condition with the HP Recovery Manager if Windows Vista is not accessible (it will apply to 7 as well).

Recover Windows Vista Operating System Using HP Recovery HP Pavilion dm3-1030us Entertainment Notebook PC - HP Customer Care (United States - English)

Do you know what you deleted?

A Guy