Go to google throme and tpye windows 7
if you have original windows 7 disc, you can reinstall it if you have recovery windows 7 disc, you can fix it
You just put in the installation disk for Win 7 and it will reinstall itself over the existing OS.
Windows Update.
Via Windows update
Update Win98 from the Microsoft website that should help.
Windows 8.1 can be downloaded and installed on a Windows 7 PC, but Windows 8.1 is not an update it is a new operating system. This new operating system can be bought from Microsoft for $119.99.
It can be regarded as both. It is an update on Windows 8.0 and could be seen as an upgrade on Windows 7 or older systems.
Yes it can be rerun to preform an reinstall of the system.
it depends on what is wrong with it. you could reinstall vista or get windows 7 but that is only an absolute last resort.
You have to reinstall Windows. Use you windows DVD and reinstall the OS. If you are uncertain, take help from a professional.
yes!