Use sfc.exe /scannow as stated by Flatcher.
Open Command Prompt with Run as Adminstrator
After that, I recommend doing a chkdsk /f /r on Command Prompt with Adminstrator also.Which will fix any errors and check for any bad sectors on your harddrive.
Try also http://www.dll-files.com/ which you could download the missing .dll and put it into your windows folder.
If all else fails. There is Windows 8 Consumer Preview which works pretty well. I been using it on my very old laptop and it works fine. Uses even less resources then windows 7 however at the stake of learning some new shortcuts. If Windows 8 Consumer Preview is not a option. Use Ubuntu 12.04 64-Bit or Fedora.
Open Command Prompt with Run as Adminstrator
After that, I recommend doing a chkdsk /f /r on Command Prompt with Adminstrator also.Which will fix any errors and check for any bad sectors on your harddrive.
Try also http://www.dll-files.com/ which you could download the missing .dll and put it into your windows folder.
If all else fails. There is Windows 8 Consumer Preview which works pretty well. I been using it on my very old laptop and it works fine. Uses even less resources then windows 7 however at the stake of learning some new shortcuts. If Windows 8 Consumer Preview is not a option. Use Ubuntu 12.04 64-Bit or Fedora.