Hello mahar and welcome to SevenForums.
First have a look at this tutorial:
http://www.vistax64.com/tutorials/70563-boot-up.html
If you want to speed up your Shut Down, there is a Tutorial
here
Just before Cleaning via CCleaner, run Disk Cleanup and Disk Defragmenter.
Then I would download and open
CCleaner and use
CCEnhancer for more features. Then go to the
Clean Tab,
Analyze and run the
Cleaner. Next go to
Tools (
NEVER GO TO REGISTRY) and select
Startup, select them all and select
Disable and then
Remove.
Then click on
CCleaner's Uninstall Tab and remove anything you don't need or use. Ask here if you are unsure if it is safe to remove or not, or you could
Google it.
Next, read this article:
99 ways to Make Your Computer Blazingly Fast
This guide was intended for
Windows XP, but I would ignore
Step 2,
Step 10,
Step 11,
Step 16,
Step 28,
Step 37.
Another guide can be found here:
Optimize Windows 7
I would next run an
SFC Scan and a
Check Disk Scan.
The final thing I would do is open
MSConfig again, select
Boot and select
No GUI Boot, this will
disable the
Boot Animation.
Finally I would use
MSE and
Malwarebytes to check for Viruses and Malware.
If none of these steps help, please report back.