WinXP, Zone alarm, Microsoft Security Essentials

Dell XPS400 desktop

I've been having various troubles with my computer for a few days, slowing, mouse freezing and so on, so tonight I ran the free Kaspersky scan and found scary results.

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KASPERSKY ONLINE SCANNER 7.0: scan report

Thursday, September 23, 2010

Operating system: Microsoft Windows XP Professional Service Pack 3 (build 2600)

Kaspersky Online Scanner version: 7.0.26.13

Last database update: Wednesday, September 22, 2010 20:38:39

Records in database: 4237982

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Scan settings:

scan using the following database: extended

Scan archives: yes

Scan e-mail databases: yes

Scan area - My Computer:

A:\

C:\

D:\

G:\

Scan statistics:

Objects scanned: 167438

Threats found: 1

Infected objects found: 1

Suspicious objects found: 0

Scan duration: 04:59:23

File name / Threat / Threats count

C:\Documents and Settings\Jan\Application Data\Sun\Java\Deployment\cache\6.0\31\781da39f-38ec3980 Infected: Trojan-Downloader.Java.Agent.hi 1

Selected area has been scanned.

I have searched for this trojan and gotten as far as seeing the folder marked "31," but don't know whether opening that to find 781da39f-38ec3980 inside will "deploy" it, or what.

Can I just open "31" and if 781da39f-38ec3980 is inside, simply click to delete it, or are things more complicated?

It is the middle of the night. I am going to run a full MWB scan, too, to see what it finds. Superantispyware didn't find this trojan last night.