[Rob]

how lucky i saw this, i am an ICT technician for a living!

step 1.

Try using Windows restore, restore it to a week or two ago and this should solve it.

step 2.

If the above fails run a virus scan, the delete any findings, then complete a disk defrag.

step 3.

If the above fails the you need to re-image your machine. Get any important data off first, once this has completed then put the data back on, do not open this data, make the computer scan the documents folder thoroughly to check no viruses have hidden in those files.