My Dell laptop (Vista) updated (security) last week (I'm not mega-techy so bear with my non-techy speak!) and since then I've had all manner of issues.

My emails (Windows Live Mail) arrive but in thumbnails that will not open, they don't even try!  I cannot create or reply to emails that arrive.

Photoshop/Paintshop pro editing programs open but do not work.  (I can open a photo and crop, for example) but it won't save the file.

I can browse the internet and watch vids, but when on Twitter, the vids won't play.

I know the issues (apart from emails) are petty, but I'm listing them in case relevant. 

I have uninstalled and reinstalled Paintshop pro which solved the problem, only to find that, going back to it the next day wasn't working again., so I'm a bit loathed to do this with Live mail (or similar) as it seems it will just be back to square one after loading all of the family email accounts in.

Anyway, it's a shot in the dark, I'd be grateful of any ideas.