1. The very first thing is restart your computer.
2. The next thing if you just install software or change some setting on your computer undo it.
3. Figure out the last time your computer worked well , and do a system restore to the day before that, system restore can be found under accessories\ system tools
4. Run windows updates and your virus updates to see if this helps your issue.
5. Find a friend or coworker and ask if they have had a similar problem more like they have or knows someone who has.

Creating a Windows 7 USB Install Drive with official Microsoft Tool

Though the demographic is likely small there are certainly a group of Media Center enthusiasts who have already started using a more centralized server setup to store movie media removing the need for a DVD drive on their actual Media Center machine. This goes for many main stream desktop machines as well, with the ability to buy practically any digital media online and download it directly the need for physical distribution is dropping quite sharply. If you happen to be one of these users but are in possession of the standard Windows 7 DVD though, how do we get the operating system onto our drive-less machine? Read more

Windows 7 GodMode
Here’s a neat Windows 7 trick that’s been doing the rounds on the Internet. It enables “GodMode,” a term devised by the Microsoft development team, which provides a single place to access all Windows settings without needing to browse options and folders in the Control Panel.

To use it:

Create a new folder.
Rename the folder to
GodMode.{ED7BA470-8E54-465E-825C-99712043E01C}

(note that you can change the “GodMode” text, but the following period and code number are essential).

The folder icon will change — double click it to show the GodMode window

The easiest way to defragment your computer in Windows XP all the way to Windows 7 is to type the following in the Run Command Box “defrag C: -f ”