|For your Device Manager problem, click the "Microsoft Fix it" button halfway down this page: http://support.dell.com/support/ind...|
Please note, however, that the fix only works if you are getting the error message as described at top of that page when you try to open Device Manager.
However, it will not do any harm to try that fix. It will either fix it or it won't.
If you aren't getting the error message as described and the fix doesn't work, please post again for further help.