Upon start up keep pressing f2, f8 or f11 depending on your system > go into BIOS > boot in safe mode > http://windows7themes.net/how-to-replace-explorer-exe-in-windows-7.html
Also > type in the windows search bar for example HP restore, Sony restore, Acer restore to see if it has a factory settings restore program.
http://windows7themes.net/how-to-replace-explorer-exe-in-windows-7.html
Maintaining your computer:
Control panel > Programs and features > remove all unwanted programs, make sure you know what it is your removing.
1. Left click on C drive> properties/run windows disc cleaner
2. Download Ccleaner from here: http://www.filehippo.com/
3. Install Ccleaner and run the cleaner top left, then run the registry cleaner below it on the left. you don’t need to backup the registry
4. Left click on C drive> properties>Tools> check now/disc scanner or in the case of Vista it’s called something else > tick both boxes > start, Prompt the scanner to scan upon next reboot and REBOOT COMPUTER)
#(Prepare to wait up to an hour)#
5. After Disk scan/Disk check has finished run windows Disc Cleaner again, Ccleaner again and registry cleaner again.
6. Then you must do a DEFRAGMENTAION of C drive which is START>ALL PROGRAMS>ACCESSORIES>TOOLS>DEFRAGMENTATI…
Additional options: If an unpaid version, remove curent antivirus first.
Free Microsoft Essentials Anti-virus http://www.microsoft.com/security/pc-security/mse.aspx
If you have the original CD of your operating system use it to install a fresh copy.
You will then need to install the hard drive controller driver as well as the Intel chip-set driver/Mother board drivers. Then you will need to install all the peripheral drivers. I.E Sound card and graphics card.
If you don't have the recovery disk.
http://www.ehow.com/how_4910631_download-windows-xp-recovery-disk.html
http://neosmart.net/blog/2008/windows-vista-recovery-disc-download/
Vista recovery.
http://neosmart.net/blog/2009/windows-7-system-repair-discs/
Windows 7 recovery