How can I improve image resolution using Adobe software?

Without seeing your image nobody can advise on specific techniques, but if you don't even have a full Photoshop, then there is almost zero chance that anything can be done about improving your image. Image recovery/ restoration can involve tons of steps with multiple filters, paint operations, adjustments etc.., none of which web-based services can provide. Of course there are alternatives to PS out there, but if the computer is realyl that old, even they might not run.

Mylenium

As there exist methods to resize images, you should really know what you are doing. There exists no method to enhance a bad image. Most probably, you get an image that has all its defects more visible.

@Sashalexandermander 

The best way is use a camera shoots in high resolution and will take images in RAW format. What kind of camera are you using?

Jane

<moved from using the community >