I cannot drag copy or past file

Hi every One;

I have windows XP with SP2 after checking for the new updats and down load them I noticed that I lost the paste function in windows explorer and my computer; I still can copy but I can not past at all even using Ctrl + V will not do it I did a search in microsoft help but I there was nothing helpful there. any help will be a appreciated thanks.
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Try running sfc /scannow from Start Menu -> Run.
Then use an updated Anti Virus and have a full system scan
Try also with Stinger http://vil.nai.com/vil/stinger/.
After that, be sure that the issue is not malware related, using Spybot and AD-Aware (for download details, take a look for example here: http://www.experts-exchange.com/Web/Browser_Issues/Q_20975384.html)
It might have something to do with the RPC or lsass services.
When they crash you lose cut, paste, drag+drop etc.

Try and check the event log and look out for anything about RPC or lsass.

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