Am just asking on the off chance that one of you genius' could help me with an issue which is melting my brain at present.

A couple of weeks ago my three year old came along and sat at my locked laptop and pressed a couple of keys randomly.
As a result the little whizz changed the screen from landscape to potrait and apparently totalled my internet connection

I fixed the screen display no problem, but have since tried everything to sort out my internet problems with limited success (including reformatting my harddrive

The stage I am at now is that I can use the interent but it's intermitent. This forum has timed out on me (so as every other site I've used since the reformat a week ago) about 20 times so far in the past hour and a half.
"TheTechGuys" from PC world are willing to 'book it in' for a service but it will be with them for up to 28 days. Quite simply, I can not afford to be without my computer that long.
Do any of you have any suggestions for how to fix this?
Info that may (or may not!) be useful to know:
- It's an advent laptop that's about four months old.
- My partners laptop (bought at same time) is less than one metre from mine and does not have any issues.
- Speedtest.net shows that I have good internet connection although the site times out on me a lot
- The laptop seems to be ok when on cable as opposed to wireless.
- I had thought that it was the wireless card but "TheTechGuys" say it can't be if it's intermitent.
Any thoughts/suggestions would be truely welcome.
Thank you