if you are able to get into safe mode, doing a system restore will return the computer back to the last checkpoint. any programs you have installed since the last restore checkpoint was made will need to be reinstalled. all text files etc, will remain, they don't rely on the registry. the only thing that relies on the registry is actual programs, (i.e. if you have doom3, and you installed it after the most recent restore point, you will have to reinstall it, however if you installed it before the date on the most recent restore point, it will stay intact)
any further questions please ask.
to do a system restore,
To use the System Restore Wizard, make sure you're logged on as an administrator, and then follow these steps:1.Click Start, point to All Programs, point to Accessories, point to System Tools, and then click System Restore.
2.On the Welcome screen, click Restore my computer to an earlier time, and then click Next.
3.On the Select a Restore Point page, select the date from the calendar that shows the point you'd like to restore to, as shown in Figure 2, and then click Next.
4.On the Confirm Restore Point Selection page, verify that the correct restore point is chosen, and then close any open programs.
5.Click Next if you are ready to proceed or click Back to change the restore point.
6.The computer will shut down automatically and reboot. On reboot, you'll see the Restoration Complete page, and then click OK.