Windows 7 - 'Open with' every time I try to open a program

So I've spent a while browsing and can't find anything related to the problem I'm having.

My girlfriend recently lent me her laptop (Windows 7 32bit) it was still using IE so when I go to install chrome the built in 'security program' (Windows 7 internet security 2011 or something like that) tells me that chrome is a threat and wont let me use it.. Now after finding out that Windows 7 internet security 2011 is a joke and just wants my money I run spybot search and destroy, it finds plenty of viruses and such like which are all removed.

Now I have the strange problem...
When I try to run any program or file the 'open this file with' window comes up. With some programs I can browse the program files and locate the program, select open with (I can't select 'always use the selected program') and away we go, but with others it simply doesn't open or will open the program in the background (unusable) and give me the 'open with' window again.. I have tried putting the Malwarebytes installer on USB but the laptop still gives me the 'open with' window when I try to install that...

...What do??

Thanks in advance, Joey.

Windows 7 internet security 2011 is a rogue anti-virus ... in other words, its an infection.
Remove Internet Security 2011 (Uninstall Guide)

Hello Joey, and welcome to Seven Forums.

After you make sure that your computer is clean as Jacee posted above, you could download and merge the exe and lnk (LNK) options in the tutorial below to fix the "Open With" issue. It will restore the default associations for these file extensions.

Default File Type Associations - Restore

Hope this helps,
Shawn

Thanks for the speedy help guys, hopefully we wont have to speak again for a while

Joey

You're most welcome Joey. I'm glad that we could help.