Automation Programme

Hey, bit of a long shot but always worth a try. Pretty much I'm needing some software to automate repetitive tasks on a locked down work PC that can't have software installed. I'm assuming if it was possible the device or software would have to pretend it's a mouse or keyboard to my work laptop from another device in order to carry out these tasks?

Needing this software to pretty much copy a cell in excel, paste this into a field on a Web page, select a couple of buttons on the Web page, type text into a field and then start again.

Any ideas on software or a device I could purchase?

Thanks everyone for your suggestions