Upgrade Windows 7 to Windows 8 (instantly)
Steps:
Open windows 7 and run windows 8 Setup(DVD)
Choose any of the 3 choices, recommended is 1st one "Keep Windows settings, personal files, and apps" this will keep your system settings saved in windows 8 as "windows.old folder in c:\ drive " which you can delete any time with the help of Disk Cleaner.
Setup then checks for any incompatible software, it displays list of those applications which are not compatible with windows 8 better uninstall them one by one.
If you are using Dell PC with windows 7, your Bluetooth driver might be incompatible so uninstall it, you can download compatible driver from the support.dell.comNow, your system will restart several times, just leave it and finally windows 8 welcome screen will arrive!
Congratulations, you have a new windows 8 PC now but all your system settings are as it is, besides that all your software are also installed in the same folder as it was before and it just works even more better.
* But things not over yet metro apps won't work right now, reason behind it is your antivirus closes it. Solution to this problem is that you have to reinstall your antivirus software and then every thing just works fine.*