I'd be grateful for help/advice. My Windows 7Ultimate is BSODing frequently - the bluescreen says DRIVER
IRQ NOT LESS OR EQUAL or similar.
The machine is old (I bought it secondhand ~ 15 months ago), but it has had the motherboard, RAM & graphics card replaced since then. It's not used for any task more demanding than downloading/watching AVIs/Libreoffice/GNUCash/Thunderbird. The BSODs occur practically every time MS Security Essentials does a full scan, as well as up to ~5 times a day when the PC feels like it!
The Windows 7 is a retail version (32 bit), and replaced Win XP that came installed when I bought the machine. The Win 7 was originally installed on 050710 and worked flawlessly until the motherboard broke earlier this year - the current installation dates from ~060611.
Any help or advice will be gratefully received!