Hi Suzy
If your existing Win 7 DVD does not include SP1 ( Service Pack 1) and you are on a slow broadband connection then downloading the file Ztruker suggests makes a lot of sense...However please be very careful when downloading ImgBurn, it's a good product to create easily a bootable disc from a downloaded .iso, but nowadays it tends to have lots of less desirable applications bundled along with it (stuff you may not want on your computer) so please be very careful and be prepared to use a different .iso "burner" if necessary.
The order is fairly simple for Win 7, you need to download your iso burner, ImgBurn or alternative, then the Win 7.iso and then burn it to DVD.You only need to input your Win 7 product serial key when you install Win 7 from the DVD you made.
To reinstall Microsoft Office (Word, Excel.PowerPoint, Publisher, Outlook, Access etc) you will need the installation CD/DVD (or downloaded executable file) and its product serial key.
You should also make sure that you have your drivers backed up and take particular care to have your Ethernet or wi fi driver handy, so if Win 7 does not include the driver you need (sometimes it does, sometimes it doesn't) for Internet access, at least you will be able to install them and so get online...
If you are in any doubt about the software and licences you have on your computer then it would be wise to download Belarc Advisor. run it and print out the output, this will give you a list of all the important software on your computer and their licence numbers. Download is available from here:
http://www.belarc.co...e_download.html
I would hate to discourage you from undertaking the tasks you have in mind, by exaggerating the difficulties and dangers that you might face, but on the other hand I would like you to be informed as to the amount of work and potential difficulties that you might face so you go into this task with your eyes wide open and aware of some of the potential pitfalls.
Many folks who have no great experience successfully undertake a format and reinstall, and update Windows with all the latest updates, install all the required drivers, install their protections (firewall, anti virus, anti spyware etc) then all their software and then carefully copy across their important data files from their back ups and end up with a reliable fast and virus free machine set up exactly as they like...they then take a disc image or two ( validate them) and then can feel sanguine about getting on with using their computers again for ordinary purposes.
HOWEVER
some folks embark on a similar course of actions but for one reason or another things do not go smoothly..... frustrations creep in, and perhaps access is made to the Internet to download some essential element BEFORE all their protections are in force...and that way leads to a potential disaster....
Ken is the real expert on the effects of malware on a computer and the cleaning steps necessary, but YES it is possible (and very easy in fact) to reinfect a computer by copying across files from a back up made on an infected machine. I usually tell my customers that if a computer is infected then they should consider their back ups potentially compromised and not to use them at all until they have been thoroughly checked and declared clean by a competent technician or malware removal expert.
I recommend that you consider carefully before proceeding with the format and reinstall and if you are in any doubt about the ultimate outcome, get a quotation from a competent local computer technician to do the work for you.
In a well equipped workshop with competent technicians the outcome should be assured and the work will /should be performed expeditiously and should deliver the results you want.
Good luck
Regards
paws