mY computer is infected

Windows XP SP2
using Kaspersky internet security 2009

Things were well till day before yesterday..my friend came to me with an external hard disc..which i used after scanning. Kaspersky detected some 20 viruses and deleted the same. then i used the extenral hard disc

after removing the same i started facing problems
1. Whenever i try to open an icon in the desktop or double click on them everything disappears for a moment,,,then reappears...if i m trying again it opens normally
2. Sometime explorer error message is coming,, like windows encountered a problem like that

i have done full scan with kaspersky ,,and it found some virus again deleted the same...even then problem remained
keeping kaspersky off i scanned with malwarebytes...as someone suggested and got 292 infected files and deleted all of them...problem still remained
again i used Avira personal eddition and repeated scannig it also found some 3 infections and removed (i noted TR/Crypt.ZPACK.Gen2 as one among the reported infections) which i suppose Avira has successfully removed,,,

what i should do next,,my problem remains the same as mentioned in paragaraph 1

HELP!!!!!

Please post the results of your MBAM scan for review.

To retrieve the Malwarebytes Anti-Malware scan log information, launch MBAM.

• Click the Logs Tab at the top.
  • The log will be named by the date of scan in the following format: mbam-log-date(time).txt
    -- If you have previously used MBAM, there may be several logs showing in the list.
• Click on the log name to highlight it.
• Go to the bottom and click on Open.
• The log should automatically open in notepad as a text file.
• Go to Edit and choose Select all.
• Go back to Edit and choose Copy or right-click on the highlighted text and choose Copy from there.
• Come back to this thread, click Add Reply, then right-click and choose Paste.
• Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
• Exit MBAM when done.

Logs are saved to the following locations:
-- In XP: C:\Documents and Settings\<Username>\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Logs
-- In Vista: C:\Documents and Settings\Users\All Users\Malwarebytes\Malwarebytes' Anti-Malware\Logs