double click doesn't work since installing ff - i have windows xp os.
when trying to download mahjong firefox was installed. since then double click doesn't work on my windows xp desktop shortcuts - including ff shortcut. internet explorer doesn't stay open either.
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Sounds suspicious. You may want to run some supplemental scans. These two tools are highly regarded:
Malwarebytes Anti-malware : http://www.malwarebytes.org/products/malwarebytes_free
SUPERAntiSpyware : http://www.superantispyware.com/
Have you tried making IE your default browser again? It's under Tool > Internet Options > Programs (or Windows Control Panel > Internet Options > Programs)