My OS is Windows Vista Home Premium 32bit, SP1.
G'Day Aigurs,
To answer your question first.
I'm in a similar situation and set-up to yourself [check My System Specs], and likewise, automatically run Defragmentation of C: and D: drives on a weekly basis. I have had the need a couple of times to do a System Restore, and have noticed no ill effects of the defragmentation, so there shouldn't be any problems. I also run Auslogics defragmentation from time to time.
It is a very useful and easy run defragmentation tool listed here;
Vista Forums>Software>Free Software List for Vista, or here;
http://www.vistax64.com/software/115872-free-software-list-vista.html
and is available free for download from Auslogics, here;
Auslogics - Download Auslogics Disk Defrag
Welcome!
Welcome to Vista Forums Aigurs :D , and all the best for 2009 from Aussie Mate!! You will find a great bunch of people here, always willing to help you if you get into any strife, and who are ready to answer any questions about Vista and all of its workings and interactions etc., that you may have. I had no problems understanding your English at all. And if you don't understand an answer that is given, just post again asking for a simpler explanation.
Your 'My Systems Specs'
It will also
help the helper "

!!", if you just take a couple of minutes to read the Post info in the link at the bottom of my page, and then go to your
User CP to put as much detail into your
'My System Specs', as you possibly can. It sure saves typing it out over and over again when you need assistance, and will often mean a quicker reply from the 'helpers'......"

!!!!"....Weird bunch that they are.
Your 'Little Helper' - Vista Forums SysInfo Tool.
You can access your system information quite easily,
by downloading an extremely useful tool from Vista Forums>Tutorials>Software. With this tool, you'll be able to find
most of the information for your '
My System Specs' input.
Access the tool here, and just follow the simple instructions for downloading;
VistaForums SysInfo Tool
I downloaded mine to the Desktop, where it sits, ready for use in any situation. However, thanks must go to
Shao 128 and
dmex for giving us the use of this great little number.
All Vista Forums Information.....FAQs.
The best method to find information about
anything in this Vista Forum, is to just click on FAQ in the bar at the top of each page. You'll find this to be one of the best Forum resources, and the amount of detail in FAQs is well presented and easily read.
Any Problems in setting up? Just ask.
Enjoy your stay Mate. :D Cheers. sassofalco