My Acer 7736Z-4809 laptop (pre-installed w/ Win7 Home Premium 64bit, so I don't have the Win7 CD) was recently hit with a virus. I constantly got the BSOD "iaStor.sys" and a black screen. Startup Repair at first couldn't complete repair, but when I tried again, it found no errors. Tried System Restore to no avail. Was able to do a System Image Recovery using a backup on an external HD, but none of the programs worked (wanted to use Ad-Aware and Spybot to eliminate the virus). When I clicked on programs on the desktop or Start menu, nothing happened, didn't even get an "Open with." Even in Safe Mode, none of the programs worked. I checked the Task Mgr, and explorer.exe was still there, but RAID wasn't. Went to Control Panel Programs to uninstall/repair programs, but got message that programs seemed to be already uninstalled...it was like the programs weren't even recognized. Once in awhile when I clicked on IE8 in Windows Explorer (not via desktop shortcut or Start menu), IE8 actually opened, so I downloaded Hijack This and Avast anti-virus, but when I tried to install them, I got the msg: "Installation must be on a local hard drive." Continued to get the "iaStor.sys" BSOD. I read to run Verifier and disable it, so I tried that (not sure if that made things worse). Tried to do another System Image Recovery, but this time it couldn't recognize the backup on the ext HD. Tried Startup Repair, and it couldn't complete repair. Went to Recovery Management to reset the OS, but my User ID(?) couldn't be found. Decided to do a Factory Install - during "Setup is preparing your computer for first use" I got the error msg: "The computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed. To install Windows, click 'OK' to restart the computer, and then restart the installation." Every time I try to restart it, I get the same error msg. BIOS Setup Defaults: Quiet Boot: [Enabled] Network Boot: [Enabled] F12 Boot Menu: [Disabled] D2D Recovery: [Enabled] SATA Mode: [AHCI] Thanks in advance.