Working on a DELL Insperion 1525 for a friend. Originally had Vista, but after not keeping up on virus protection, it bacame infected beyond repair. Installed W7 6 months ago and turned over to friend. Has been working flawlessly until recent. He said he shut it down, next day went to start and it loads to the welcome screen where normally it has account logins listed. Instead, it just shows the background. nothing else except the mouse pointer, which works with the mouse. Tried every start up option I could get to, along with repair, safe mode, last known good config, etc. Nothing works. Running repair options leads to the hang up on welcome screen, running normal start-ups, last known, etc makes the computer restart before the welcome screen. Next I went into BIOS and set up to load from CD. Put the W7 disc in and restarted. Went to the region, settings etc. Tried the repair option with the disc installed. It goes through the motions for repair, then gets to the welcome screen and hangs there. Tried this multiple times, even left it on all day. Just sits there with the welcome splash screen background, and a moveable mouse pointer. Searched online for solutions and ran across many others that have ran into this problem, but no solutions. They all get recommendations to install W7 disc and run repair. Stumped.